Respostas

2014-04-25T02:47:13-03:00
A) 4x² - 25 = (2x + 5) . (2x - 5)
b)
2x² + 8x - 3x - 12
2x(x + 4) - 3(x + 4)
(2x - 3)(x + 4)

^^
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2014-04-25T03:40:07-03:00
A) 4x²-25= (2x-5).(2x+5)

b) 2x²+5x-12= (2x-3)(x+4) = 2x² + 8x - 3x - 12

=2x² + 5x - 12
2 5 2