1971 AHSME Problem 20

The sum of the squares of the roots of the equation x^2+2hx=3 is 10. The absolute value of h is equal to

\textbf{(A) }-1\qquad \textbf{(B) }\textstyle\frac{1}{2}\qquad \textbf{(C) }\textstyle\frac{3}{2}\qquad \textbf{(D) }2\qquad \textbf{(E) }\text{None of these}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.