Question

Use a regrinha e calcule :
a) (a-c)²=
b) (x-4)²=
c) (3y-2t)²=
d) (5s-3)²=

Answer 1

a) (a-c)²=

(a - c)(a - c)

a² - ac - ac + c²

a² - 2ac + c²

b) (x-4)²=

(x - 4)(x - 4)

x² - 4x - 4x + 16

x² - 8x + 16

c) (3y-2t)²=

(3y - 2t)(3y - 2t)

9y² - 6yt - 6yt + 4t²

9y² - 12yt + 4t²

d) (5s-3)²=

(5s - 3)(5s - 3)

25s² - 15s - 15s + 9

25s² - 30s + 9