Question

Calcule os produtos

a) (X + 2) • (X - 3)

b) X • (X + Y - 3)

c) (5 x - 6) • (5 x - 6)

d) (7 x - 9)²

Answer 1

$a)( x)^{2} - (3)^{2} = {x}^{2} - 9 \\ b) {x}^{2} + xy - 3x \\ c)(5x - 6)^{2} \\ d)(7x)^{2} - 2.7x.9 + {9}^{2} = 49 {x}^{2} - 126x + 81$

Answer 2

letra A( x+2)= 2(x-3)= 0

X=20