Question

Teorema de Pitágoras
(×+9)² = (3×+3)² + (2×)²=

Answer 1

(x+9)²=(3x+3)²+(2x)²
(x+9).(x+9)=(3x+3).(3x+3)+ (2x). (2x)
x²+9x+9x+81=9x²+9x+9x+9+4x²
x²+18x+81=13x²+18x+9
x²+18x-13x²-18x=-81+9
-12x²=-72
x²=-72/-12
x²=6
x=√6
espero ter ajudado, Abraços