SOLUTION: x^2+10x-128. I've had this problem a few times now (I'm a tutor myself) and it asks to solve for x. I just cannot factor this. Please help me refresh my algebra skills and help me
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Question 274328: x^2+10x-128. I've had this problem a few times now (I'm a tutor myself) and it asks to solve for x. I just cannot factor this. Please help me refresh my algebra skills and help me find a way to solve for x on this one. Thank you.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
It doesn't factor over the rationals. Check the discriminant, that is 
. Works out to 612. Not a perfect square. In fact, the best you can do is 
Exact solution set: 
using the quadratic formula.
Of course the trinomial does factor -- it is just uglier than a mud fence:
\left(x\ +\ 5\ -\ \sqrt{153}\right))
John
