# If #f(x) = 2x^2 + 5# and #g(x) = 3x + a#, how do you find a so that the graph of (f o g)(x) crosses the y-axis at 23?

##### 1 Answer

Jul 30, 2016

I assume that

#### Explanation:

First let's find

Now the graph crosses the y-axis when

We may first divide the equation by

Then the two solutions are