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Nairaland Forum / Entertainment / Forum Games / How Old Is She, Her Mum, And Her Dad? (41201 Views)
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Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 12:50am On Apr 08, 2019 |
ePlanet:Try this sir Solve (√2 +1)^x +(√2 -1)^x=34 |
Re: How Old Is She, Her Mum, And Her Dad? by ePlanet: 1:13am On Apr 08, 2019 |
ifada123: is the sq rt covering everything in both brackets? |
Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 1:55am On Apr 08, 2019 |
ePlanet:The square root is covering only 2 |
Re: How Old Is She, Her Mum, And Her Dad? by Samizaya(m): 4:55am On Apr 08, 2019 |
100 - 43 = 57 , 43 - 5 = 38 & 38÷2= 19; Therefore 43+38+19=100, So the child is 19 yrs old |
Re: How Old Is She, Her Mum, And Her Dad? by IamPlato(m): 7:17am On Apr 08, 2019 |
UyaiIncomparabl:Olodo In School Those Days Spotted! |
Re: How Old Is She, Her Mum, And Her Dad? by Youngjohnosas: 7:37am On Apr 08, 2019 |
Offpoint:I tire o boss, the intimidation nor b here. |
Re: How Old Is She, Her Mum, And Her Dad? by Mutemenot(m): 8:04am On Apr 08, 2019 |
momove4real25: One love |
Re: How Old Is She, Her Mum, And Her Dad? by yarnme2(m): 8:42am On Apr 08, 2019 |
frankomale1: Girl = x Mother = 2x Dad = 2x + 5 - Girl + Mother + Dad = 100 - x + 2x + (2x + 5) = 100 - 5x = 100 - 5 - 5x = 95 - x = 95/5 - x = 19 - Girl = 19 - Mother = 2 x 19 = 38 - Dad = 38 + 5 = 43 |
Re: How Old Is She, Her Mum, And Her Dad? by ibk4God(f): 8:43am On Apr 08, 2019 |
CodeTemplar: I Like the way you break it down. Thumb up! |
Re: How Old Is She, Her Mum, And Her Dad? by mechanics(m): 9:05am On Apr 08, 2019 |
ShyWhale:you are right. |
Re: How Old Is She, Her Mum, And Her Dad? by mechanics(m): 9:07am On Apr 08, 2019 |
Bizmagnet:mathematician, I can remember that solving in my junior secondary school days. |
Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 9:07am On Apr 08, 2019 |
IkpuMmadu:The clue is if you were my student I will reduce your mark. Instead of 10/10 you get 6/10 |
Re: How Old Is She, Her Mum, And Her Dad? by fippycbk(m): 9:45am On Apr 08, 2019 |
masterpiecer: Lol. I wanted to solve it but people had already done that. It's still basic algebra. |
Re: How Old Is She, Her Mum, And Her Dad? by TourismMan(m): 10:30am On Apr 08, 2019 |
Toseenlove:Lol |
Re: How Old Is She, Her Mum, And Her Dad? by ImaIma1(f): 10:42am On Apr 08, 2019 |
Bizmagnet: Mathematician. Nice |
Re: How Old Is She, Her Mum, And Her Dad? by oloriLFC(f): 11:15am On Apr 08, 2019 |
masterpiecer:
|
Re: How Old Is She, Her Mum, And Her Dad? by skedy1(m): 11:16am On Apr 08, 2019 |
Joystark:Haha.. I swear! |
Re: How Old Is She, Her Mum, And Her Dad? by mozele(m): 6:12pm On Apr 08, 2019 |
Bizmagnet: u Don y teach me maths today |
Re: How Old Is She, Her Mum, And Her Dad? by mozele(m): 6:13pm On Apr 08, 2019 |
CodeTemplar: thanks for the elaborated solvings sir |
Re: How Old Is She, Her Mum, And Her Dad? by imonisweet(m): 6:45pm On Apr 08, 2019 |
ifada123:Bros you sure say this your question legit so |
Re: How Old Is She, Her Mum, And Her Dad? by Bizmagnet: 7:31pm On Apr 08, 2019 |
ifada123:First find the log of both sides Log(√2 +1)^x+ log (√2 -1)^x = log34 xlog(√2 +1) + xlog(√2 -1) = log34 x[log (√2 +1) + log(√2 -1)]= log34 xlog[(√2 +1)(√2 -1)]=log34 xlog(2-1) = log34 x = log34/log1 x=log34-log1 x=1.5315-0= 1.5315 |
Re: How Old Is She, Her Mum, And Her Dad? by kayalla(f): 12:09am On Apr 09, 2019 |
ah maths, my greatest fear then and till now. |
Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 6:36am On Apr 09, 2019 |
Bizmagnet:U try but ur assumption is not accurate If a+b=c Loga +logb is not equal to logc Rather Log(a+b)=logc, Try again sir If you don't mind send me ur Facebook name via Micah ifada I will add u to message group were we play with maths. |
Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 6:40am On Apr 09, 2019 |
imonisweet:Yes very correct, If you don't mind send me ur Facebook name via Micah ifada I will add u to message group were we play with maths. |
Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:55pm On Apr 11, 2019 |
princeking2:Hahahaha! |
Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:57pm On Apr 11, 2019 |
fennels007:Very simple. Understanding basic concepts and not just memorising. |
Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:57pm On Apr 11, 2019 |
olioxx:Lol. I dey try! |
Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:59pm On Apr 11, 2019 |
FromZeroToHero:Thanks man! 1 Like 1 Share |
Re: How Old Is She, Her Mum, And Her Dad? by catalan15(m): 2:53pm On Apr 14, 2019 |
obashiakpu:Funny..... |
Re: How Old Is She, Her Mum, And Her Dad? by Obinoscopy(m): 5:48am On Jun 18, 2020 |
ifada123:(√2 +1)^x +(√2 -1)^x=34........eq 1 √2 +1 is actually equal to 1/(√2 -1). So one is the inverse of the other. We can use this relationship to solve further: Let a = √2 +1.........eq 2 Therefore (√2 +1)^x becomes a^x and (√2 -1)^x becomes a^(-x). Thus eq 1 becomes: a^x + a^(-x) = 34........eq 3 Let a^x = y.....eq 4 Therefore eq 3 becomes: y + 1/y = 34......eq 5 Solving eq 5 further gives the quadratic equation: y^2 - 34y + 1 = 0.....eq 6 y = 17 + 12√2.....eq 7 and y = 17 - 12√2......eq 8 Recall that y = a^x and that a = √2 +1. Thus eq 7 and 8 becomes: (√2 +1)^x = 17 + 12√2.....eq 9 and (√2 +1)^x = 17 - 12√2.....eq 10 Solving eq 9: (√2 +1)^x = 17 + 12√2 Find log of both sides: Log (√2 +1)^x = Log (17 + 12√2) x Log (√2 +1) = Log (17 + 12√2) Thus x = Log (17 + 12√2)/Log (√2 + 1) = 4 Similarly, solving eq 10 gives: x = Log (17 - 12√2)/Log (√2 + 1) = -4 In conclusion, the answer is ±4 |
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