Explicación paso a paso:
a) x²-4x+7=0
b) -12x²-3x+9=0
c) -5x²+11x+6=0
d)2x²-8x+12=0
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Explicación paso a paso:
a) x²-4x+7=0
b) -12x²-3x+9=0
c) -5x²+11x+6=0
d)2x²-8x+12=0