Х^2+2х-35=(х-5)(х-а)
X^2+2x-35=x^2-ax-5x+5a
X^2+2x-x^2+ax+5x-5a-35=0
7x+ax-5a-35=0
(7x+ax)+(-5a-35)=0
X(7+a)-5(a+7)=0
(x-5)(7+a)=0
x-5=0 7+a=0
x=5 a=-7
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Х^2+2х-35=(х-5)(х-а)
X^2+2x-35=x^2-ax-5x+5a
X^2+2x-x^2+ax+5x-5a-35=0
7x+ax-5a-35=0
(7x+ax)+(-5a-35)=0
X(7+a)-5(a+7)=0
(x-5)(7+a)=0
x-5=0 7+a=0
x=5 a=-7