Question

I am working on factoring trinomials of the form ax2+bx+c.

 

I'm on this problem:

8y2-23y+15

And I have this so far for an answer:

=(2y ? 3)(4y ? 5)

When I add up the outside product and the inside product I get 23 if both the signs are positive but if I try to make the 23 a negative by changing the signs it adds up to -7. I can't figure out how to get the -23.

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