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Mathematics
Problem
Sum of real roots of the equation
∣
1
4
20
1
−
2
5
1
2
x
5
x
2
∣
=
0
\begin{vmatrix} 1 & 4 & 20 \\ 1 & -2 & 5 \\ 1 & 2x & 5x^2 \end{vmatrix} = 0
1
1
1
4
−
2
2
x
20
5
5
x
2
=
0
is a. -2 b. -1 c. 0 d. 1
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