-х3 +6х2 +7х -42 =0
-x^2(x-6)+7(x-6)=0
(7-x^2)(x-6)=0
7-x^2=0 x-6=0
-x^2=-7 x=6
x^2=7
x=+-корен7
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-х3 +6х2 +7х -42 =0
-x^2(x-6)+7(x-6)=0
(7-x^2)(x-6)=0
7-x^2=0 x-6=0
-x^2=-7 x=6
x^2=7
x=+-корен7