Question

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

1

4

−10

−6

Answer 1

distribute!
4x(x-3) + 2(x-3)

Answer 2

Distribute it first\[(a + b)(c + d) = ac + ad + bc + bd\]

Answer 3

4x^2-12+2x-6
4x^2+2x-18

Answer 4

No, it's - 12x

Answer 5

so,
4x^2+2x-12
?

Answer 6

No, what I meant is 4x^2 - 12x + 2x - 6 = 4x^2 - 10x - 6

Answer 7

oh okay so now what do i do? :/

Answer 8

The standard form of a quadratic equation is y =ax^2 + bx + c. So find b

Answer 9

do i subtract?

Answer 10

No, you compare the two equations.
y = 4x^2 - 10x - 6 and
y = ax^2 + bx + c. What is b?

Answer 11

-10

Answer 12

Yes