Question

Simplifique as expressões:

a) (ײ +3×).(×-4)
b) (xy -7).( xy +6)
c) (x² + 3× - 4).( x - 2)
d) 3. ( x +1) - 2 . (X - 2) - 4 . (- × +5)

Answer 1

$a) \\ (x^2 +3x).(x-4) \\ \\ x^3 - x^{2} -12x$

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$b) \\ (xy -7).(xy +6) \\ \\ \\ xy (xy - 7) +6xy - 42$

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$c) (x^2 + 3x - 4).(x - 2)$
$x^{3} + x^{2} -10x + 8$

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$d) \\ 3*( x +1) - 2*(x - 2) - 4*(-x +5) \\ \\ \\ 3x + 3 -2x + 4 +4x - 20 \\ \\ 5x - 13$