x(x+6)-7x-42=0 (x-2)(x-3)-(x-4)(x+5)=0 4 3 2 x – 2x + 10x – 20x=0

x(x+6)-7x-42=0
(x-2)(x-3)-(x-4)(x+5)=0
4 3 2
x – 2x + 10x – 20x=0

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  1. Đáp án:

    x(x+6)-7x-42=0

    ⇔x (x+6)-7(x+6)=0

    ⇔(x+6)(x-7)=0

    x=-6

    x=7

    (x-2)(x-3)-(x-4)(x+5)=0

    x ²-5x+6-(x ²+x-20)=0

    -6x+26=0

    x=13/3

    x^4-2x ³+10 x ²-20x=0

    x ³(x-2)+10x(x-2)=0

    x(x-2)(x ²+10)=0

    x=0

    x=2

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