Squaring an Expression
Source:
February 6, 2009
Problem Statement
The square of 5\minus{}\sqrt{y^2\minus{}25} is:
(A)\ y^2\minus{}5\sqrt{y^2\minus{}25} \qquad
(B)\ \minus{}y^2 \qquad
(C)\ y^2 \\
(D)\ (5\minus{}y)^2 \qquad
(E)\ y^2\minus{}10\sqrt{y^2\minus{}25}