Question

When the quadratic equation y = (x - 3)(2x + 7) is written in standard form, what is the value of the coefficient "b"?

Answer 1

Do you know how to use the "FOIL" rule.
Standard qudratic notation is \[a x^{2}+bx+c\]

Answer 2

HINT: standard form

Answer 3

ax^2+bx+c=y

Answer 4

you are looking for b, as stated.

Answer 5

yes, expand the brackets, and look for the coefficient of x

SPOILER:

(x -3)(2x+7) = x(2x+7) - 3(2x + 7) = 2x^2 + 7x - 6x - 21 = 2x^2 + x - 21