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

y = (x − 3)(4x + 2)
y = 4x² + 2x − 12x − 6
y = 4x² − 10x − 6
y = ax² + bx + c ⇒ b = −10 <<<------Answer

Answer 2

really?

Answer 3

i would have never got that

Answer 4

Yes it was easy just take your time and do the equation on paper than redo it the other way to double check your answer.