[toán casio 9] phân tích thành nhân tử

V

vipboycodon

a. $3x^3+5x^2-14x+4$
= $3x^3-x^2+6x^2-2x-12x+4$
= $x^2(3x-1)+2x(3x-1)-4(3x-1)$
= $(3x-1)(x^2+2x-4)$

b. $2x^3-x^2-3x-1$
= $2x^3+x^2-2x^2-x-2x-1$
= $x^2(2x+1)-x(2x+1)-(2x+1)$
= $(2x+1)(x^2-x-1)$
 
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