Question

Utilizando as regras dos produtos notáveis, calcule:
a) (3x + 9)² =
b) (a - b)² =
c) (2x + 3)(2x - 3) =
d) (3y - 5)² =
e) (a - 4y)² =
f) (ab + a) (ab - a) =​

Answer 1

a) (3x + 9)² = $9x^2+54x+81$

b) (a - b)² = $a^2-2ab+b^2$

c) (2x + 3)(2x - 3) = $4x^2-12x+3$

d) (3y - 5)² = $9x^2-30x+25$

e) (a - 4y)² = $a^2+8ay+16y^2$

f) (ab + a) (ab - a) = $a^2b^2-a^2$