Question

1. [9.01] When the quadratic equation y = (x − 4)(2x + 5) is written in standard form, what is the value of the coefficient "b"? (4 points)
2
3
−3
−20
2. [9.01] Identify which equation is a quadratic equation. (4 points)
y = −5x − 3
y = −4x(x + 10) + 34
y + x2 = (x − 4)(x + 3)
y − 2 = (x − 2)(x2 + 1)
3. [9.01] Determine whether the graph of y = 2x2 − 5x + 8 opens up or down and whether it has a maximum or minimum point. (4 points)
Down and Maximum
Down and Minimum
Up and Minimum
Up and Maximum

Answer 1

Did you multiply it out and put it in the form :
\[ax^2+bx+c=y\]

Answer 2

No ?
@Mertsj

Answer 3

Well do that first. You know FOIL, I assume...or some other method for multiplying two binomials?

Answer 4

I have no idea what your saying, can I have answers?

Answer 5

It is against the OS Code of Conduct to just give out answers. The entire idea of the website is to help students learn not to help them get a good grade.

Answer 6

(x − 4)(2x + 5)
Multiply those two binomials

Answer 7

Whatever

Answer 8

What class are you taking?

Answer 9

Algebra 1

Answer 10

(a+b)(c+d)=ac+ad+bc+bd
Use that

Answer 11

I don't know how dude

Answer 12

@ThatHippieKid to multiply two binomials, this is what you do:
\[(x − 4)(2x + 5)\]\[((x\times2x+x\times5)+(-4\times2x+-4\times5))\] then you would solve it. that's how you do it.