Question

Phân tích đa thức thành nhân tử

a. \(5x\left(x-2y\right)+2\left(2y-x\right)^2\)

b. \(7x\left(y-4\right)^2-\left(4-y\right)^3\)

c. \(\left(4x-8\right)\left(x^2+6\right)-\left(4x-8\right)\left(x+7\right)+9\left(8-4x\right)\)

d. \(x^2-xz-9y^2+3yz\)

e. \(x^2\left(x^2-6\right)-x^2+9\)

Answer 1

a)

\(5x(x-2y)+2(2y-x)^2=5x(x-2y)+2(x-2y)^2\)

\(=(x-2y)[5x+2(x-2y)]=(x-2y)(7x-4y)\)

b)

\(7x(y-4)^2-(4-y)^3=7x(y-4)^2+(y-4)^3=(y-4)^2(7x+y-4)\)

c)

\((4x-8)(x^2+6)-(4x-8)(x+7)+9(8-4x)\)

\(=(4x-8)(x^2+6)-(4x-8)(x+7)-9(4x-8)\)

\(=(4x-8)[(x^2+6)-(x+7)-9]=(4x-8)(x^2-x-10)=4(x-2)(x^2-x-10)\)

d)

\(x^2-xz-9y^2+3yz=(x^2-9y^2)-(xz-3yz)\)

\(=(x-3y)(x+3y)-z(x-3y)=(x-3y)(x+3y-z)\)

e)

\(x^2(x^2-6)-x^2+9=x^4-7x^2+9=(x^4-6x^2+9)-x^2\)

\(=(x^2-3)^2-x^2=(x^2-3-x)(x^2-3+x)\)

Answer 2

a)

\(5x(x-2y)+2(2y-x)^2=5x(x-2y)+2(x-2y)^2\)

\(=(x-2y)[5x+2(x-2y)]=(x-2y)(7x-4y)\)

b)

\(7x(y-4)^2-(4-y)^3=7x(y-4)^2+(y-4)^3=(y-4)^2(7x+y-4)\)

c)

\((4x-8)(x^2+6)-(4x-8)(x+7)+9(8-4x)\)

\(=(4x-8)(x^2+6)-(4x-8)(x+7)-9(4x-8)\)

\(=(4x-8)[(x^2+6)-(x+7)-9]=(4x-8)(x^2-x-10)=4(x-2)(x^2-x-10)\)

d)

\(x^2-xz-9y^2+3yz=(x^2-9y^2)-(xz-3yz)\)

\(=(x-3y)(x+3y)-z(x-3y)=(x-3y)(x+3y-z)\)

e)

\(x^2(x^2-6)-x^2+9=x^4-7x^2+9=(x^4-6x^2+9)-x^2\)

\(=(x^2-3)^2-x^2=(x^2-3-x)(x^2-3+x)\)