Question

When the quadratic equation y = (x − 3)(4x + 2) is written in standard form, what is the value of the coefficient "b?"

Answer 1

Multiply (x - 3)(4x + 2)

Answer 2

\( \color{Black}{\Rightarrow x(4x + 2) - 3(4x + 2) }\)

\( \color{Black}{\Rightarrow 4x^2 + 2x - 12x - 6 }\)

\( \color{Black}{\Rightarrow 4x^2 - 10x - 6 }\)

b is the coefficent of x, so it is -10.