Question

Expand the expression to a polynomial in standard form:
left parenthesis, minus, 2, x, minus, 1, right parenthesis, left parenthesis, x, squared, plus, 9, x, plus, 3, right parenthesis
(−2x−1)(x
2
+9x+3)

Answer 1

Multiply term-by-term:

(−2x−1)(x^2+9x+3)
= −2x(x^2+9x+3) −1(x^2+9x+3)
= (−2x^3 −18x^2 −6x) + (−x^2 −9x −3)
= −2x^3 −19x^2 −15x −3.