Question

What is the value of the coefficient "b" when the quadratic equation y = (3x − 5)(2x + 3) is written in standard form?

a. 19
b. 6
c. −15
d. −1

Answer 1

Do you know what standard form is?

Answer 2

ya y=mx+b

Answer 3

That's standard form for a linear equation, but this is a quadratic equation which has a different standard form. This is standard form for a quadratic equation: \[\Large y=ax^2+bx+c\]

Answer 4

ok...

Answer 5

Simplify the equation and compare with the standard form

Answer 6

So can you multiply this together?

y = (3x − 5)(2x + 3)

Answer 7

ok...

Answer 8

Good. Tell me when you get stuck.

Answer 9

ok

Answer 10

6x^2 +9x-10x-15

Then I combine like terms right?

Answer 11

@Kainui

Answer 12

Yep! Good work!

Answer 13

so the answer is -1

Answer 14

=) Perfect, exactly right.

Answer 15

Thanks so much!!!!