Question

Simplify the expression below:

4x(3x-7) -19x^2

A) -35x^2

B) -31x^2-28x

C) -7x^2-28x

D) -7x^2-7

Answer 1

C. -7x^2 - 28

Explanation:

Firstly simplify the bracket before doing anything;

4x(3x - 7) = 12x^2 - 28x

then go back to the question and substitute the expression(12x^2 - 28x) on the bracket and then work out the question;

12x^2 - 28x -19x^2...then group the values with the same exponent of x,

(12x^2 - 19x^2) - 28x

; -7x^2 - 28x