Question

Help with algebra :)

Answer 1

1. [9.01] When the quadratic equation y = (x − 5)(2x + 3) is written in standard form, what is the value of the coefficient "b"? (4 points)
7
−7
2
−15
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 = −3x2 − 4x + 10 opens up or down and whether it has a maximum or minimum point. (4 points)
Down and Minimum
Down and Maximum
Up and Maximum
Up and Minimum
4. [9.01] What is the vertex for the graph of y = −2x2 + 8x − 13? (4 points)
(2, 11)
(2, −5)
(−2, −37)
(−2, −21)
5. [9.01] The graph of which equation is shown below?

(4 points)
y = −x2 + 6x − 5
y = −x2 − 6x − 5
y = x2 + 6x − 5
y = x2 − 6x − 5
6. [9.02] What are the solutions of x2 − 3x − 18 = 0? (4 points)
x = 3, x = −6
x = −3, x = 6
x = 3, x = 6
x = −3, x = −6
7. [9.02] What are the x-intercept(s) of the graph of y − x2 = −3x − 10? (4 points)
(2, 0) and (−5, 0)
(−2, 0) and (5, 0)
(−2, 0) and (−5, 0)
(2, 0) and (5, 0)
8. [9.02] What are the solutions of 6x2 − x − 2 = 0? (4 points)
x = , x = −
x = −, x =
x = , x = −1
x = −, x = 2
9. [9.02] Solve 6x2 = 18x. (4 points)
x = 0, x = −3
x = 0, x = 3
x = 6, x = −3
x = 6, x = 3

Answer 2

Please I really need help!

Answer 3

anybody?

Answer 4

Use the foil method to get the first equation into standard form. Can you get that far?

youtube video on the foil method.

http://www.youtube.com/watch?v=65BAsV0SK3k

Answer 5

ya I got the first one done myself and got -7

Answer 6

Standard form for quadratic is

\[Ax ^{2}+Bx +C\]

Answer 7

I got y = −4x(x + 10) + 34 on the second one

Answer 8

and Down and Maximum one the third

Answer 9

thats how far I am

Answer 10

OK, you are the first three correct.

You can find the vertex by either completing the square, or using -b/2a=x and then solving for the y value by substituting the value you got for x back into the equation.

Answer 11

I did all that and I still couldnt get one of the multiple choices

Answer 12

:/

Answer 13

Can someone at least answer number 4 and 5?
#5 graph is https://www.connexus.com/content/media/527934-762011-84933-AM-1383066450.png

Answer 14

You dont have to answer the first 3 or last 2

Answer 15

I have to leave. But the answer to four is (2,-5)

-8/2(-2)=2 So x=2

-2(2)^2+8(2)-13= -5

Answer 16

ok what about 5