Question

Determine the quadratic equation represented by the factorization: y=(4x-1)(x+7)

A. y=x^2-x+28

Answer 1

y = 4x² + 27x - 7

Explanation:

y = (4x - 1)(x + 7)

Opening the brackets:

y = 4x² + 28x - x -7

y = 4x² +27x - 7

Answer 2

4x^2 + 27x - 7

Explanation:

Multiply out (4x - 1)(x + 7);

f(x) = 4x^2 + 28x - x - 7, or 4x^2 + 27x - 7