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2x²+8x-3x-12=21x-42
2x²+5x-21x=12-42
2x²-16x=-30
2x² -16x+30=0← ECUACIÓN CUADRÁTICA.
Resuelto Por Factorizacion:
2x² -16x+30=0
=
=
=
=
=
=(x-5) (2x-6)
Conjunto Solución:
x₁=5
x₂=3