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
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.