SOLUTION: 3 (square root symbol) 9+x=15 How do we solve for X? We know the correct answer is 16, but we don't know why!

Algebra ->  Square-cubic-other-roots -> SOLUTION: 3 (square root symbol) 9+x=15 How do we solve for X? We know the correct answer is 16, but we don't know why!      Log On


   

Question 660766: 3 (square root symbol) 9+x=15
How do we solve for X? We know the correct answer is 16, but we don't know why!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
3%2Asqrt%289%2Bx%29=15

sqrt%289%2Bx%29=15%2F3

sqrt%289%2Bx%29=5

9%2Bx=5%5E2

9%2Bx=25

x=25-9

x=16

So the solution is x=16
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Check:

3%2Asqrt%289%2Bx%29=15

3%2Asqrt%289%2B16%29=15

3%2Asqrt%2825%29=15

3%2A5=15

15=15

So the answer is verified.

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