Question

a) 4 ( 2 - x ) tất cả mũ 2 + xy - 2y b) x ( x- y ) tất cả mũ 3 - y ( y- x ) tất cả mũ 2 - y mũ 2 ( x- y ) c) 3ax mũ 2 + 3bx mũ 2 + bx + 5a +5b

Answer 1

`a)4(2-x)^2+xy-2y=4(2-x)^2-y(2-x)=(2-x)[4(2-x)-y]=(2-x)(8-4x-y)`

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`b)x(x-y)^3-y(y-x)^2-y^2(x-y)`

`=x(x-y)^3-y(x-y)^2-y^2(x-y)`

`=(x-y)[x(x-y)^2-y(x-y)-y^2]`

`=(x-y)(x^3-2x^2y+xy^2-xy+y^2-y^2)`

`=(x-y)(x^3-2x^2y+xy^2-xy)`

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`c)3ax^2+3bx^2+5a+5b`

`=3x^2(a+b)+5(a+b)`

`=(x+b)(3x^2+5)`