Question

Find the expression that is equivalent to 3(x2 + 2x + 5).

7x2 - 18 - 4x2 – 3 + 6x
7x2 +18 - 4x2 – 3 + 8x
7x2 +18 - 4x2 – 3 + 6x
7x2 +18 - 3x2 – 3 + 6x

Answer 1

c. 7x2 +18 - 4x2 – 3 + 6x

Explanation:

3(x^2 + 2x + 5)

3x^2 + 6x + 15

a.) 7x^2 - 18 - 4x^2 – 3 + 6x

= 3x^2 - 21 + 6x

b.) 7x^2 +18 - 4x^2 – 3 + 8x

= 3x^2 + 15 + 8x

c.) 7x2 +18 - 4x2 – 3 + 6x

= 3x^2 + 15 + 6x

d.) 7x2 +18 - 3x2 – 3 + 6x

= 4x^2 + 15 + 6x