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y=c(x^2) + d
2y=10
In the systems of equations above, c and d are constants . For which of the following values of c and does the system of equations have no real solutions?
A) c=-6, d=6
B) c=-5, d=4
C) c=6, d=4
D) c=6, d=5
Please help, thank you.

At long last, and just in time for the summer prep rush, the Math Guide is back to showing “usually ships in 1-2 days” at Amazon. (UPDATE 5/30/2020: now it’s all the way back in stock!) I still don’t have stock to ship myself, so if you want a physical book you have to go (more…)