Đáp án:
x^2+6x-3x-18=x(x+6)-3(x+6)=(x+6)(x-3)
Giải thích các bước giải:
Ta có : x2+3x−18=x2−3x+6x−18
=x(x−3)+6(x−3)=(x−3)(x+6).
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