Answer:
Step-by-step explanation:
(4x^2-2x+8)+(x^2+3x-2)
Collect like terms
5x^2+x+6
5x^2+x+6 dont know if you need to siplify it any more
20
This is a right triangle
a² + b² = c²
16² + 12² = x²
256 + 144 = x²
400 = x²
take the square root of both sides
x = 20
