SOLUTION: Trying to help my daughter with her maths but it's been a long time! Pythagoras theory. Side 1 = x Side 2 = 15 Hypotenuse = x+5 Find x?

Algebra ->  Pythagorean-theorem -> SOLUTION: Trying to help my daughter with her maths but it's been a long time! Pythagoras theory. Side 1 = x Side 2 = 15 Hypotenuse = x+5 Find x?       Log On


   

Question 343468: Trying to help my daughter with her maths but it's been a long time!
Pythagoras theory.
Side 1 = x
Side 2 = 15
Hypotenuse = x+5
Find x?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
From the Pythagorean theorem,
A%5E2%2BB%5E2=H%5E2
x%5E2%2B15%5E2=%28x%2B5%29%5E2
Use the FOIL method to expand the right hand side...
x%5E2%2B225=x%5E2%2B5x%2B5x%2B25
x%5E2%2B225=x%5E2%2B10x%2B25
10x%2B25=225
Take it from there to solve for x