Question

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

2

−21

−1

1

Answer 1

First multiply the expressions in brackets. Can you do that?

Answer 2

yeah FOIL it? or naw

Answer 3

What do you get?

Answer 4

oh its -21!

Answer 5

No. The 'c' term is -21. You need the coefficient of the 'x' term.

Answer 6

it said "b" term though?

Answer 7

The standard form of a quadratic is
\[ax ^{2}+bx+c\]

Answer 8

oh true.. so it would be 1.

Answer 9

So when you multipy out the terms in brackets what number is in the 'b' position?

Answer 10

Yes. The correct choice is 1. Good work :)

Answer 11

thank you :D

Answer 12

You're welcome :)