Question

(x+3)(x²+3x-5)

Answer 1

Giải:

\(\left(x+3\right)\left(x^2+3x-5\right)\)

\(=x^3+3x^2-5x+3x^2+9x-15\)

\(=x^3+\left(3x^2+3x^2\right)+\left(-5x+9x\right)-15\)

\(=x^3+6x^2+4x-15\)

Chúc bạn học tốt!

Answer 2

\(\left(x+3\right)\left(x^2+3x-5\right)\)

\(=x^3+3x^2-5x+3x^2+9x-15\)

\(=x^3+6x^2+4x-15\)

Answer 3

\((x+3)(x^2+3x-5)\)

\(=x(x^2+3x-5)+3(x^2+3x-5)\)

\(=x^3+3x^2-5x+3x^2+9x-15\)

\(=x^3+6x^2+4x-15\)