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Jamb Math Question That 'jammed' Most Students - Can You Solve It? - Education - Nairaland

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Jamb Math Question That 'jammed' Most Students - Can You Solve It? by originalKsp(m): 12:11pm On Jul 28, 2016
Factorise the given expression [ see solution http://samimath.com/q-a-factorization-2/]

Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by Heromaniaa: 12:15pm On Jul 28, 2016
Do people still solve this things?
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by 4kings: 1:10pm On Jul 28, 2016
After equating d expression to zero:
3^2 = (x^2 - 3x - 1)^2
Removing squares:
3= (x^2 - 3x - 1)
After opening bracket;
3+1 = x^2 -3x
4 = x^2 - 3x
x^2 - 3x -4=0
Getting values for 3x dat is common to x^2 & -4
x^2 - 4x + x - 4 = 0
-:, x(x - 4) + 1(x-4) = 0
(x+1) = 0 & (x-4) = 0
Therefore:
x = -1
x = 4

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Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by FarukuWadata12(m): 1:21pm On Jul 28, 2016
the final answer is -8.
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by naturalwaves: 1:42pm On Jul 28, 2016
4kings:
After equating d expression to zero:
3^2 = (x^2 - 3x - 1)^2
Removing squares:
3= (x^2 - 3x - 1)
After opening bracket;
3+1 = x^2 -3x
4 = x^2 - 3x
x^2 - 3x -4=0
Getting values for 3x dat is common to x^2 & -4
x^2 - 4x + x - 4 = 0
-:, x(x - 4) + 1(x-4) = 0
(x+1) = 0 & (x-4) = 0
Therefore:
x = -1
x = 4
Damn! Did you see an equal to sign there that you are getting specific answers? Don't you know what factorisation is?
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by naturalwaves: 1:42pm On Jul 28, 2016
FarukuWadata12:
the final answer is -8.
Factorise is what the queation says. Damn!
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by Nobody: 1:57pm On Jul 28, 2016
-(x-1)(x+1)(x-2)(x-4)

Secondary school days were all fun for me

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Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by 4kings: 2:02pm On Jul 28, 2016
naturalwaves:

Damn! Did you see an equal to sign there that you are getting specific answers? Don't you know what factorisation is?

Hmm, then in that case I think the solution will be
3^2 - (x^2 - 3x - 1)^2

Going further will get u nowhere(though am not 100% sure)
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by naturalwaves: 2:04pm On Jul 28, 2016
4kings:


Hmm, then in that case I think the solution will be
3^2 - (x^2 - 3x - 1)^2

Going further will get u nowhere(though am not 100% sure)
Okay. Will get a pen once I settle down.
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by 4kings: 2:06pm On Jul 28, 2016
naturalwaves:

Okay. Will get a pen once I settle down.

I'm waiting
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by 4kings: 2:07pm On Jul 28, 2016
AnalyticEngine:
-(x-1)(x+1)(x-2)(x-4)
Please can u elucidate.
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by Nobody: 2:17pm On Jul 28, 2016
4kings:
Please can u elucidate.
9-(xsq-3x-1)sq = 3sq - (xsq -3x -1)sq
=(3+xsq-3x-1)(3-xsq+3x+1) ...differences of squares
= (2-3x+xsq)(4+3x-xsq) = -(2-3x+xsq)(xsq-3x-4) = -(2-3x+xsq)(x-4)(x+1) = -(x-2)(x-1)(x-4)(x+1) or (2-x)(x-1)(x-4)(x+1)

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Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by 4kings: 2:48pm On Jul 28, 2016
AnalyticEngine:


9-(xsq-3x-1)sq = 3sq - (xsq -3x -1)sq

=(3+xsq-3x-1)(3-xsq+3x+1) ...differences of squares

= (2-3x+xsq)(4+3x-xsq)
= -(2-3x+xsq)(xsq-3x-4)
= -(2-3x+xsq)(x-4)(x+1)
= -(x-2)(x-1)(x-4)(x+1) or (2-x)(x-1)(x-4)(x+1)

Dammmmmmmmmmm,
I can't believe I missed that(difference of square). Thanks.

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Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by leahcimzil: 3:08pm On Jul 28, 2016
it pains me when people call these stupid ass equations hard. What will you now do when you come across calculus or abstract algebra. Btw, i think the answer is (x-4) (x+1)

it's not hard, it's annoying

modified

9 - (x^2 - 3x - 1)^2


= 3^2 - (x^2 - 3x - 1)^2


difference of two squares

(3 - (x^2 - 3x - 1)) ( 3 + (x^2 - 3x - 1))

(3 - x^2 + 3x + 1)( 3 + x^2 - 3x - 1)

( - x^2 + 3x + 3 + 1)( x^2 - 3x + 3 - 1)

= ( - x^2 + 3x + 4)( x^2 - 3x + 2)

= ( - (x^2 - 3x - 4)) ( x^2 - 3x + 2)


= ( - ((x - 4)(x + 1)) ((x - 2)(x - 1))

it's actually

= - (x - 4)(x + 1)(x - 2)(x - 1)
Re: Jamb Math Question That 'jammed' Most Students - Can You Solve It? by leahcimzil: 3:13pm On Jul 28, 2016
AnalyticEngine:


9-(xsq-3x-1)sq = 3sq - (xsq -3x -1)sq

=(3+xsq-3x-1)(3-xsq+3x+1) ...differences of squares

= (2-3x+xsq)(4+3x-xsq)
= -(2-3x+xsq)(xsq-3x-4)
= -(2-3x+xsq)(x-4)(x+1)
= -(x-2)(x-1)(x-4)(x+1) or (2-x)(x-1)(x-4)(x+1)
damn difference of two squares...it's annoying

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