Question

a) (8+2)(8-2) b) (-2y+5x)(2y-5x) c) (k-3)(k+3) d) (3p+5)(3p-5)

Answer 1

Resposta passo a passo:

a) (8+2)(8-2)

8.8 + 8.(-2) + 2.8 + 2.(-2)

64 - 16 + 16 - 4  = 60

b) (-2y+5x)(2y-5x)

- 2y.2y - 2y. (-2y) + 5x.2y - 5x.(-5x)

-4y² + 4y² + 10xy + 25x² = 10xy + 25x²

c) (k-3)(k+3)

k.k + 3k - 3k - 3.3 = k² - 9

d) (3p+5)(3p-5)

3p.3p + 3p.(-5) + 5.(3p) + 5.(-5)

9p² + (-15p) + 15p = 9p² - 15p + 15p = 9p²