Question

If y=2x^2-4x-5 what is the value of y when x=-3?

Answer 1

go to http://www.enotes.com/homework-help/how-do-find-any-x-y-intercepts-f-x-2x-2-4x-5-98403

Answer 2

i hope this helps

Answer 3

you just replace the x in the given y :) like this
y= 2 times ( -3)^2 -4 times (-3) -5
y = 2 times 9 +12 -5
y= 18+12-5
y= 25
And there you go, that basically all you need to do. hope this help

Answer 4

Thank you.
I also am stuck on this:
Equivalent.
5r-3>2r+6?

r>1/3. r>3

r>1. r>6

Answer 5

Leong?

Answer 6

yes

Answer 7

so it just like this:
5r-3>2r+6?
5r-2r-3>2r-2r+6
3r-3>6
3r-3+3>6+3
3r>9 ( divide 3 for each side)
r>3
So your answers should be r>3 :)