Toán Lớp 8: giúp em
pt đt thành nt
x^4-x^3-6x^2+15x-9
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Toán Lớp 8: giúp em
pt đt thành nt
x^4-x^3-6x^2+15x-9
Comments ( 2 )
=(x^4-x^3)-(6x^2-6x)+(9x-9)
=x^3(x-1)-6x(x-1)+9(x-1)
=(x-1)(x^3-6x+9)
=(x-1)[(x^3+3x^2)-(3x^2+9x)+(3x+9)]
=(x-1)[x^2(x+3)-3x(x+3)+3(x+3)]
=(x-1)(x+3)(x^2-3x+3)