Question

resposta e conta (x+b)(x-b)=x(x-b3)

Answer 1

x²-bx+bx-b²=x²-bx+3x
x²-b²=x²-bx+3x
-b²+bx+3x
-b=x+3x
-b = 4x
b= -4x

Espero ter ajudado