Toán Lớp 8: x^3-7x+6……………………………………
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Toán Lớp 8: x^3-7x+6……………………………………
Comments ( 2 )
= x^3 – x^2 + x^2 – x – 6x + 6
= x^2(x – 1) + x(x – 1) – 6(x – 1)
= (x – 1)(x^2 + x – 6)
= (x – 1)(x^2 + 3x – 2x – 6)
= (x – 1)[x(x + 3) – 2(x + 3)]
= (x – 1)(x + 3)(x – 2)