Question

Indique no caderno a alternativa correta.
(Ulbra-RS) Sendo A = x²+x e b=x²-x o valor de 2AB é?
a) zero
b) 2x/4-x³-2x²
c) 2x/4-x³-x²
d) 2x/4-2x²
e) 2x/4-x²

Answer 1

A= x2 + x
B = x2 - x

A = x ( x + 1 )
B = x ( x - 1 )

2 AB = 2x 2* ( x + 1 )* ( x - 1 )
2AB = 2x2 * ( x2 - 1 )
2AB = 2x4 - 2x2
opção d