Question

Khai triển:

a) (x - 5)(x\(^2\) + 5x + 25)

b) (x + 6)(x\(^2\) - 6x + 36)

c) (2x – 3y)(4x\(^2\) + 6xy + 9y\(^2\) )

Answer 1

a: \(=x^3-125\)

b: \(=x^3+216\)

c: \(=8x^3-27y^3\)

Answer 2

a, \(\left(x-5\right)\left(x^2+5x+25\right)=x^3-125\)

b, \(\left(x+6\right)\left(x^2-6x+36\right)=x^3+216\)

c, \(\left(2x-3y\right)\left(4x^2+6xy+9y^2\right)=8x^3-27y^3\)