Question

Multiply.

3х2 -7х + 4
5х2 + 2х
А. 15х4 – 35х3 + 20х2 + 8x
ов. 15 – 35х3 + 6х2 + 8x
Ос. 15х4 - 29х3 + 20х2 + 8x
OD. 15х4 – 29х3 + 6х2 + 8x

Answer 1

option D

Explanation:

we have from statement:

(3х2 -7х + 4)*(5х2 + 2х)

we apply distributive property:

3х2 * 5x2 + 3x2 * 2x - 7x * 5x2 -7x * 2x + 4 * 5x2 + 4 * 2x

so we have:

15x4 + 6x3 - 35x3 - 14x2 + 20x2 + 8x

finally we have:

15x4 - 29x3 + 6x2 + 8x