2x^2 - 7x - 30=
2(x^2-3.5x-15)=
2(x^2+2.5x-6x-6*2.5)=
2(x(x+2.5)-6(x+2.5))=
2(x-6)(x+2.5)
Ответ: 2x^2-7x-30=2(x-6)(x+2.5)
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2x^2 - 7x - 30=
2(x^2-3.5x-15)=
2(x^2+2.5x-6x-6*2.5)=
2(x(x+2.5)-6(x+2.5))=
2(x-6)(x+2.5)
Ответ: 2x^2-7x-30=2(x-6)(x+2.5)