Question

Giúp e hai câu cuối ạ

Answer 1

c) x³ + y³ - 3x - 3y

= (x³ + y³) - (3x + 3y)

= (x + y)(x² - xy + y²) - 3(x + y)

= (x + y)(x² - xy + y² - 3)

d) x³ + 2x²y + xy² - 4x

= x(x² + 2xy + y² - 4)

= x[(x² + 2xy + y²) - 2²]

= x[(x + y)² - 2²]

= x(x + y - 2)(x + y + 2)

Answer 2

a: =x(x-5)

b: =(x-5)^2-y^2

=(x-5-y)(x-5+y)

c: =(x+y)(x^2-xy+y^2)-3(x+y)

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

d: =x(x^2+2xy+y^2-4)

=x(x+y-2)(x+y+2)