Question

03. Simplificando a expressão (x + 8).(x – 5) – (x + 2)(x – 2) – 3x, obtém-se:
a) –44
b) –36
c) –4x –44
d) 10x – 40
e) -x +6

Answer 1

(X+8).(x-5)-(x+2).(x-2)-3x
(X^2-5x+8x-40) . (X^2-2x+2x-4)-3x
X^2-5x+8x-40.X^2-2x+2x-4-3x
X^2-x^2-5x+8x+2x-2x-3x+4-40
-5x+8x+2x-2x-3x+4-40
-3x+2x-2x-3x+4-40
-5x-2x-3x+4-40
3x-3x+4-40
X= 4-40
X= -36

Resposta, letra *B*

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