(x1+1)(x2+1) =x1.x2+(x1+x2)+1
Suma de soluciones:-b/a
Producto de soluciones :c/a
Entonces:
x1.x2= -7/1
x1+x2= 5/1
Luego:
(x1+1)(x2+1) =x1.x2+(x1+x2)+1 = -7 + 5 +1 =-1
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(x1+1)(x2+1) =x1.x2+(x1+x2)+1
Suma de soluciones:-b/a
Producto de soluciones :c/a
Entonces:
x1.x2= -7/1
x1+x2= 5/1
Luego:
(x1+1)(x2+1) =x1.x2+(x1+x2)+1 = -7 + 5 +1 =-1