Question

2r^3+18r^2=20r then I rewrote it as:
2r^3+18r^2-20r=0 now what do I do?

Answer 1

factor out 2r

Answer 2

r^2(2r+18-20)

Answer 3

I forgot the =0

Answer 4

now what

Answer 5

hello anyone

Answer 6

wat r u trying to find out here?

Answer 7

I'm factoring equations

Answer 8

2r^3+18r^2=20r

2r^3+18r^2-20r = 0

2r(r^2+9r-10) = 0

Now find two numbers that multiply to -10 and add to 9 at the same time

Answer 9

-1,10

Answer 10

so r^2+9r-10 factors to (r-1)(r+10)

which means

2r(r^2+9r-10) = 0

becomes

2r(r-1)(r+10) = 0

Answer 11

See what to do from here?

Answer 12

r-1=0 and r+10=0

Answer 13

so r=1 and r=-10

Answer 14

good, but you're forgetting about the 2r out front

2r = 0

2r/2 = 0/2

r = 0

Answer 15

so r = 0, r = 1, or r = -10

Answer 16

thank you so very much

Answer 17

yw

Answer 18

:)