Question

What is the solution set for...

Answer 1

\[\sqrt{90-x}=x\]

Answer 2

square both sides

Answer 3

then subtract x^2 on both sides

Answer 4

then use quadratic formula to solve for x

Answer 5

make sure you check both possible solutions

Answer 6

Ok, so I have \[-{x^2}-x+90=0 \]
How do you factor that? Is it possible?

Answer 7

x^2+x-90=0

-90=2(-45)=10(-9)
1=10+(-9)
this should help