Question

Viết biểu thức sau thành tích:

a) x^3+1                           b)8a^3-27

Answer 1

\(a.=x^3+1^3=\left(x+1\right)\left(x^2-x+1\right)\)

\(b.=\left(2a\right)^3-3^3=\left(2a-3\right)\left(2a^2b^2+3\cdot2a+3^2\right)\)

\(=\left(2a-3\right)\left(4a^2+6a+9\right).\)

Answer 2

`a, (x+1)(x^2-x+1)`

`b, (2a-3)(4a^2 + 6a + 9)`

Answer 3

a) \(x^3+1=\left(x+1\right).\left(x^2-x+1\right)\)

b) \(8a^3-27=\left(2a\right)^3-3^3=\left(2a-3\right).\left[\left(2a\right)^2+6a+9\right]\)