Question

When the quadratic equation y = (x - 4)(2x + 5) is written in standard form, what is the value of the coefficient "b"?

Answer 1

what did you get?

Answer 2

FOIL it out...

Answer 3

the b coefficient is obtained by adding O + I
O - outside terms
I - inside terms

Answer 4

y = (x - 4)(2x + 5)
y = 2x² - 3x - 20

In Standard form :
y = ax² + bx + c
Therefore
y = 2x² - 3x - 20

Answer : b = -3