Posted by **kirs** on Thursday, April 23, 2009 at 10:42am.

y intercept:

3x^2+18x

0=3x^2+18x

from here im lost

- college algebra -
**Reiny**, Thursday, April 23, 2009 at 11:37am
what do you want to do?

solve it ?

find the y-intercept ?

- college algebra -
**kirs**, Thursday, April 23, 2009 at 2:45pm
yes find y intercept

- college algebra -
**Reiny**, Thursday, April 23, 2009 at 3:41pm
then let x = 0

so y = 3(0) + 18(0) = 0

the y-intercept is 0, the line runs through the origin.

- college algebra -
**kirs**, Friday, April 24, 2009 at 5:55pm
sorry i meant the x intercept

- college algebra -
**RickP**, Friday, May 1, 2009 at 1:16am
x intercept:

y = 3x^2+18x

0 = 3x^2+18x

3x is common to both terms on the right: factor it out.

0 = 3x(x + 6)

If 2 values are multiplied together and the product is 0, then one or both of the values must be 0.

3x = 0 and/or x + 6 = 0

Take it from there.

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