Posted by kirs on Thursday, April 23, 2009 at 10:42am.
what do you want to do?
solve it ?
find the y-intercept ?
yes find y intercept
then let x = 0
so y = 3(0) + 18(0) = 0
the y-intercept is 0, the line runs through the origin.
sorry i meant the x intercept
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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