Question

How do i find x and all three sides?

Answer 1

`x+31` and
`2x-59` are congruent sides

So we have

`2x-59=x+31`
⇒
`x-59=31`
⇒
`x=90`

Plug in:

`x+31=90+31=121`

`2x-59=2(90)-59=180-59=121`

`x-7=90-7=83`

Answer 2

well,you can use the pythagorean theorem,which is a^2+b^2=c^2 to solve for x.