Question

Find the product of x^2+2x-4 and 3x.

a. 3x^3+6x^2+12x

b. 3x^3+6x^2-12x

c. 3x^3+2x-4

d. -3x^3

Answer 1

$3x({x}^{2} + 2x - 4)$

$3x \times {x}^{2} = {3x}^{3}$

$3x \times 2x = 6 {x}^{2}$

$3x \times - 4 = - 12x$

$b. \: 3 {x}^{3} + 6 {x}^{2} - 12x$