My attention was brought to this question this afternoon.
Page 134
Question 9c
Can you get it right?
DrDre1
Najdorf
OSADNA009
ymstar
Tobisco247
Idowster
Harbidexy5
Epositive
zizzley
GreatGod2020
nnamdi640
Deffjam
Kareayo
95seun
bolu96
GeepyEnsemble
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Frankicent
punter9
Investpro14
just4fun
LamaNewton
Profmaojo
ZOLTAN007
Siimjnr03
Elvisanderson
Isokoboy
yungsmart
annie17
ScionOfLight
Darivie05
jibrinidris836
smexy
shegzy2009
Titidi
Martinez39

Stanisbaratheon
Oyatz
Rezos17
Martinez39s
Kylekent59
Fedral9
Brusoj
Rexmy
Newman20

I got 61.44. What did you get?

Hashabiah:
I got 61.44. What did you get?

That's not the answer try again please

7680

Mrshape:

That's not the answer try again please

Oga this is mathematics ; show us your method of solution.

clockwisereport:
7680

Not correct try again please

Mrshape:

That's not the answer try again please

12...what is yours?

Hashabiah:
12...what is yours?

3774.9

Mrshape:

3774.9

You are correct Bro!

The error is from the last part where we have
____
\I R = 15Q²
¯¯¯¯¯
P
____
\I R = 15 × (6.4)²
¯¯¯¯¯¯¯¯¯¯
10
____
\I R = 61.44

Now to remove the square root on the left hand side we have to square both sides (and not taken the square roots of which the textbook did, which is wrong)

Therefore, R = (61.44)²
R = 3774.9

Mrshape:
My attention was brought to this question this afternoon.
Page 134
Question 9c
Can you get it right?
DrDre1
Najdorf
OSADNA009
ymstar
Tobisco247
Idowster
Harbidexy5
Epositive
zizzley
GreatGod2020
nnamdi640
Deffjam
Kareayo
95seun
bolu96
GeepyEnsemble
Leesenpai
Frankicent
punter9
Investpro14
just4fun
LamaNewton
Profmaojo
ZOLTAN007
Siimjnr03
Elvisanderson
Isokoboy
yungsmart
annie17
ScionOfLight
Darivie05
jibrinidris836
smexy
shegzy2009
Titidi
Martinez39

Stanisbaratheon
Oyatz
Rezos17
Martinez39s
Kylekent59
Fedral9
Brusoj
Rexmy
Newman20

My answer is 7.8

This is how I got my answer.

luv2rolly:
The error is from the last part where we have
____
\I R = 15Q²
¯¯¯¯¯
P
____
\I R = 15 × (6.4)²
¯¯¯¯¯¯¯¯¯¯
10
____
\I R = 61.44

Now to remove the square root on the left hand side we have to square both sides (and not taken the square roots of which the textbook did, which is wrong)

Therefore, R = (61.44)²
R = 3774.9

luv2rolly:


You are correct Bro!

7.8 is the answer. When you are solving any question, you must be vigilant, and observant.

Lalasticlala, do the needful.

This should be on Fp. It is educative.

Ialasticlala

Seun

Mynd44

Kylekent59:


My answer is 7.8

This is how I got my answer.

You killed mathematics, you almost buried it.
But thank God some few people can still think on this forum.
I will point out your error.

Kylekent59:


My answer is 7.8

This is how I got my answer.

Observe the way I squared both side that's how it is supposed to be done.
Please learn from it

Mrshape:
Not correct try again please

I've seen my mistake. I solved it with T instead of the square root of R
Thanks all the same

Mrshape:
My attention was brought to this question this afternoon.
Page 134
Question 9c
Can you get it right?
DrDre1
Najdorf
OSADNA009
ymstar
Tobisco247
Idowster
Harbidexy5
Epositive
zizzley
GreatGod2020
nnamdi640
Deffjam
Kareayo
95seun
bolu96
GeepyEnsemble
Leesenpai
Frankicent
punter9
Investpro14
just4fun
LamaNewton
Profmaojo
ZOLTAN007
Siimjnr03
Elvisanderson
Isokoboy
yungsmart
annie17
ScionOfLight
Darivie05
jibrinidris836
smexy
shegzy2009
Titidi
Martinez39

Stanisbaratheon
Oyatz
Rezos17
Martinez39s
Kylekent59
Fedral9
Brusoj
Rexmy
Newman20

The correct answer is obviously 7.8

Here is a simplified approach to the problem.

donaytexx1:


The correct answer is obviously 7.8

Here is a simplified approach to the problem.

I shake my head.
You took square root of both side to remove square root.
I fear who no fear you o.

Mrshape:

I shake my head.
You took square root of both side to remove square root.
I fear who no fear you o.

My brother, I am really embarrassed by that terrible mistake I made. And I guess that was the kind of mistake that the textbook authors made in their solutions. If I had squared both sides (supposed to be done), I would have ended up with the right hand side being all squared, thus eliminating the occurrence of the silly mistake. But instead of squaring both sides, I simply took the square root operator from the left to the right hand side of the equation and, in the process, forgot that it should change from square root to square operator on the right hand side.

Please, I was tired and stressed out during the day, and wasn't reasoning straight again. Like you said, one must be very vigilant when solving math.

However let me repost my simplified version of the workings with the error corrected.

Thanks for pointing out the mistake. But then, pls try to be polite instead of being caustic when doing so next time; no one is above mistakes.

Thanks.

donaytexx1:


My brother, I am really embarrassed by that terrible mistake I made. And I guess that was the kind of mistake that the textbook authors made in their solutions. If I had squared both sides (supposed to be done), I would have ended up with the right hand side being all squared, thus eliminating the occurrence of the silly mistake. But instead of squaring both sides, I simply took the square root operator from the left to the right hand side of the equation and, in the process, forgot that it should change from square root to square operator on the right hand side.

Please, I was tired and stressed out during the day, and wasn't reasoning straight again. Like you said, one must be very vigilant when solving math.

However let me repost my simplified version of the workings with the error corrected.

Thanks for pointing out the mistake. But then, pls try to be polite instead of being caustic when doing so next time; no one is above mistakes.

Thanks.

I am sorry for those words I used. it was out of anger.
thanks for making the correction it shows you really know what you are doing.

Mrshape:

I am sorry for those words I used. it was out of anger.
thanks for making the correction it shows you really know what you are doing.

You are welcome, brother. Thanks for your understanding. Keep up the good work. And don't fail to mention me for the next challenge. I'll appreciate it.

God bless you.

Enjoy.

I love this thread. We need more teachers and school owners or operators like MrShape and the other participants!