Question

Calcule:
A) (a + 2) (a - 2)
B) (x-5) (x+5)
C) (a-1) (a+1)
D) (t+6) (t-6)
E) (2a+b) (2a-b)
F) (2x+2y) (2x-2y)

Answer 1

A) (a + 2)(a - 2) = a^2 - 4
B) (x - 5)(x + 5) = x^2 - 25
C) (a - 1)(a + 1) = a^2 - 1
D) (t + 6)(t - 6) = t^2 - 36
E) (2a + b)(2a - b) = 4a^2 - b^2
F) (2x + 2y)(2x - 2y) = 4x^2 - 4y^2

Espero ter ajudado!