Question

Help, Question in Comment.

Answer 1

Any ideas?

Answer 2

I am at a loss

Answer 3

do you know the formula?
hint which are solutions expect more than one answer

Answer 4

\[4x^2-20x+25 = 10\]
gather all term at one side
\[4x^2-20x+15 = 0\]
Now use the famous quadratic formula
\[\frac{ -b \pm \sqrt{b^2 - 4ac} }{ 2a }\]

Answer 5

I am using APEX. It sucks and I am not understanding the formulas