Question

Simplifique as expressões:

A) (X- 3)^2 - (X+2) ( X-2) =

B) (X + 7) × (X-7) - x^2 + 50=

C) (3x + 1) × (3x - 1) - (8x^2 + 1)=

D) (2a -3b) ( 20+ 3b) +9b^2 + 1=

Answer 1

Resposta:

$a) \: {x}^{2} - 6x + 9 - {x}^{2} - 4 \\ = - 6x - 5$

$b) \: {x}^{2} - 49 - {x}^{2} + 50 \\ = 1$

$c) \: {9x}^{2} - 1 - {8x}^{2} + 1 \\ = {x}^{2}$

$d) \: 40a + 6ab - 60b - {9b}^{2} + {9b}^{2} + 1 \\ = 40a + 6ab - 60b$