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a=2
b=1
c=-15
(x+3)(2x-5) ≡ ax²+b+cx
2x²-5x+6x-15 ≡ ax²+cx+b
2x²+x-15 ≡ ax²+cx+b
"a" , "b" y "c" seran los coeficientes de tu ecuacion , es decir los numeritos jaja
a=2
c=1
b=-15