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x^2-7x-30=0
(x-10)(x+3)=0
x-10=0. y. x+3=0
x=10. y. x=-3
dos soluciones
x=10
x=-3
prueba
x=10
x^2-7x-30=0
(10)^-7(10)-30=0
100-70-30=0
100-100=0
0=0
saludos
x..............+3
(x-10)(x+3)
igualamos a 0
x1=10
x2=-3