Question

Write the function
2 f (x ) = -2x^2 - 20x + 15

Answer 1

I think it starts off as : 2 f (x ) = -2(x + 5)^2 but im not sure about k

Answer 2

f(x)= is the same as saying y= so...
2f(x)= 2y= so...
f(x)= blahblahblah
------------ ?
2

Answer 3

nevermind the 2 in front of the fx but I have to write it in this form: f(x ) = a (x -h ) ^+ k

Answer 4

should I use complete the square method but wouldn't it say to do that in the questions?

Answer 5

I skipped algebra, what is the name of the form? not vertex form is it?

Answer 6

standard form

Answer 7

it is in standard form, you are just trying to factor it?

Answer 8

i would use quadratic myself unless they said to complete the square

Answer 9

the answer is -2(x+5)^2 and the last number K could be -65,35,65,115. I don't think its the quadratic formula

Answer 10

that was the form i was asking about, with the k value

Answer 11

that's : f (x ) = a (x -h )^2 + k

Answer 12

vertex form?

Answer 13

but no matter what I do I cant figure out K

Answer 14

it only says standard form

Answer 15

http://www.wolframalpha.com/input/?i=-2x%5E2+-+20x+%2B+15

Answer 16

try k 65

Answer 17

65-2 (x+5)^2

Answer 18

okay Nm I do have to use completing the square .... thank you! =)

Answer 19

yeah i prefer quadratic but they both work

Answer 20

sorry, I took pre algebra years ago and when I went back to school I tested out past algebra 2 and geometry. I'm doing fine in calculus but there are some common terms I don't know that I have to look up.