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Usamos la ecuacion cuadrática "ax^2+bx+c=0"
x= [-7 + o - Raiz de 7^2-4×1×(-60)]/2×1
x=[-7 + o - Raiz de 49+240]/2
x=[-7 + o - Raiz de 289]/2
x=[-7+ o - 17]/2
x=10/2
x= -24/2
1er Valor de "x"= 5
2do Valor de "x"= -12
Rpta.: a