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1:6x^2-542:x^2-4x-53:5x^3-3x^2-32x-12
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答案和解析
6x^2-54=6(x^2-9)=6(x+3)(x-3)
x^2-4x-5=x^2-1-4x-4=(x+1)(x-1)-4(x+1)=(x+1)(x-5)
5x^3-3x^2-32x-12
因为x=-2时此式为0,那么x+2必是其因式
5x^3-3x^2-32x-12
=5(x^3+2x^2)-13(x^2+2x)-6(x+2)
=5x^2(x+2)-13x(x+2)-6(x+2)
=(x+2)(5x^2-13x-6)
=(x+2)(5x+2)(x-3)
x^2-4x-5=x^2-1-4x-4=(x+1)(x-1)-4(x+1)=(x+1)(x-5)
5x^3-3x^2-32x-12
因为x=-2时此式为0,那么x+2必是其因式
5x^3-3x^2-32x-12
=5(x^3+2x^2)-13(x^2+2x)-6(x+2)
=5x^2(x+2)-13x(x+2)-6(x+2)
=(x+2)(5x^2-13x-6)
=(x+2)(5x+2)(x-3)
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