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m²=3(12,9m-2)
m²=38.7m-6
m²-38.7m+6=0
Empleando la fórmula siguiente
am²+bm+c=0
m²-38.7m+6=0
tenemos:
m=(-b+√(b²-4ac))/2a⇒m=(38.7+√(1473.69))/2=-0.15
m=(-b-√(b²-4ac))/2a⇒m=(38.7-√(1473.69))/2=-38.5