Question

Alguem me ajuda aqui
9^2=(6√2)^2 + x^2

Answer 1

X² + ( 6 V2)²  =9² 
X² + (6² * 2 )  = 81
X² + 72 = 81
X² = 81 - 72
X² = 9
V(X²)  = +-  V9
X = +- 3 ****

Answer 2

9^2=(6√2)^2 + x^2

-x^2=(6√2)^2-9^2

-x^2=36×2-81

-x^2=78-81

-x^2=-9

x^2=9

x=√9

x=+-3

{x=3}
{x'=-3}