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a² + a = 132
a² + a - 132 = 0
(a-11)(a+12) = 0
SOLUCIÓN:
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a = 11
a = -12
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ejercisio C) :
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3n² - n = 102
3n² - n - 102 = 0
9n² - 3n - 306 = 0
(3n-18)(3n+17) = 0
3n -18 = 0
3n = 18
n = 6 ==>>> SOLUCION 1
3n+17 = 9
3b = -17
n = -17/3 ==>> SOLUCION 2