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2014-07-17T01:27:37-03:00
X+6 • x+2 = 140
x² + 2x + 6x +12 = 140
x² + 8x - 128 = 0
∆ = 8² - 4•1• (-128)
∆ = 64 + 512
∆ = 576
x = -8 + 24/ 2
x = 16/2
x = 8
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a) 14+14+10+10= 48
b) 14x14 = 196
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