craigb
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Any math guys out there?
 Saw this at the bottom of a page about Chris Cornell and decided to solve it. However, my solution didn't check out going the other way and, since it's been many years I'm wondering where I went wrong. 1) To get rid of the square root symbols I squared both sides so now the equation reads ( x + 15) + x = 225 2) Subtract 15 from both sides to get x + x = 210, or 2 x = 210 3) Divide both sides by 2 to get x = 105 However, checking the answer shows that x has to be smaller than 105. 1) The square root of 120 (105 + 15) is 10.95+ 2) The square root of 105 is 10.25+ 3) Obviously 10.95 + 10.25 is greater than 15... Working it the other way by plugging in a few examples got me the real answer fairly quick (x = 49), but I'm trying to figure out where I did the normal solving wrong. Solution: 1) The square root of (49 + 15) + the square root of 49 = 15 2) The square root of 64 + the square root of 49 = 15 3) 8 + 7 = 15
Time for all of you to head over to Beyond My DAW!
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bapu
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Re: Any math guys out there?
2017/05/19 14:30:59
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Mesh
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Re: Any math guys out there?
2017/05/19 14:37:12
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Mesh
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Re: Any math guys out there?
2017/05/19 14:39:02
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Mesh
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Re: Any math guys out there?
2017/05/19 14:41:28
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Mesh
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Re: Any math guys out there?
2017/05/19 14:44:02
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quantumeffect
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Re: Any math guys out there?
2017/05/19 15:30:32
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☼ Best Answerby craigb 2017/05/20 08:46:56
Try this:
Get the x+15 that is under the sq.rt. by itself and then square both side (i.e., subtract the sq.rt. of x from 15)
sq.rt.(x+15) = 15-sq.rt.(x)
square both side:
x+15 = (15-sq.rt.(x))^2
then deal with the (15-sq.rt.(x))^2
(15-sq.rt.(x))(15-sq.rt.(x))
225-15sq.rt.(x)-15sq.rt.(x)+x
225-30sq.rt.(x)+x
x+15 = 225-30sq.rt.(x)+x
0 = 210 - 30sq.rt.(x)
210 = 30sq.rt.(x)
7 = sq.rt.(x)
49 = x
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drewfx1
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Re: Any math guys out there?
2017/05/19 17:34:56
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☄ Helpfulby craigb 2017/05/20 08:47:19
craigb
Saw this at the bottom of a page about Chris Cornell and decided to solve it. However, my solution didn't check out going the other way and, since it's been many years I'm wondering where I went wrong.
1) To get rid of the square root symbols I squared both sides so now the equation reads (x + 15) + x = 225
(x + 15) + x is wrong.
 In order, then, to discover the limit of deepest tones, it is necessary not only to produce very violent agitations in the air but to give these the form of simple pendular vibrations. - Hermann von Helmholtz, predicting the role of the electric bassist in 1877.
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bapu
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Re: Any math guys out there?
2017/05/19 18:07:28
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There's two mush X in the ecwayshun.
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KenB123
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Re: Any math guys out there?
2017/05/19 21:11:40
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49. I did it the dummies way...
Figured it should be a whole number for the square root value. Started with x = 25. Square root of 25 = 5. Plus square root of (25 +15) (i.e., 40) is ....no dice.
Okay. try next number 36. Square root of 36 is 6. Square root of (36+15) (i.e., 51) is .... no dice.
Okay, try next number 49. Square root of 49 is 7. Square root of (49+15) (i.e., 64) is 8. Ah-ha! Getting somewhere. 7 + 8 = 15. X= 49.
Grade 'A' for the answer. Grade 'F' for the solution mechanics.
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quantumeffect
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Re: Any math guys out there?
2017/05/19 21:25:06
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In other words you don’t separate the √ X + 15 and √ X
… but put brackets around it and square the whole thing.
√ X + 15 + √ X = 15
(√ X + 15 + √ X )2 = 152
I just did it by moving the √ X other side of the equation before squaring.
- note that I can't get a top on the square root thingy so you will have to use your imagination and picture the x+15 under the square root thingy.
Dave 8.5 PE 64, i7 Studio Cat, Delta 1010, GMS and Ludwig Drums, Paiste Cymbals "Everyone knows rock n' roll attained perfection in 1974. It's a scientific fact." H. Simpson "His chops are too righteous." Plankton during Sponge Bob's guitar solo
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Bhav
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Re: Any math guys out there?
2017/05/20 14:26:16
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I was extremely gifted at GCSE maths and Science.
Then I failed A level maths and got D grades in the sciences.
So then all I could do was play the piano /failure of an asian.
To put in in my school teacher's words 'he wasnt prepared for the difficulty transition between GCSE and A Levels'.
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57Gregy
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Re: Any math guys out there?
2017/05/20 15:03:31
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No one told me there would be math.
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bapu
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Re: Any math guys out there?
2017/05/20 15:08:15
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57Gregy
No one told me there would be math.
I wasn't counting on it either.
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