Question

Utilizando as regrinhas dos produtos notáveis, calcule:
a) ( x – 2y)²=
b) (x – 1)(x + 1)=
c) (5r + 3s²)²=
d) (7a – 6)²=

Answer 1

Resposta:

$a)(x - 2y) \times (x - 2y) = x {}^{2} - 4y - 4y {}^{2} \\ b)(x - 1) \times (x - 1) = x {}^{2} - 1 {}^{2} = (x - 1) {}^{2} \\ c)(5r + 3s {}^{2} )(5r + 3s {}^{2} ) = 25r {}^{2} + 30rs {}^{2} + 9s {}^{2} \\ c)(7a - 6)(7a - 6) = (49a {}^{2} - 84a - 36$