Question

Which expression does not give a result equal to the other expressions if a equals two and b equals one?

A. begin square root symbol a squared plus five end square root symbol minus b squared.
B. a squared minus begin square root symbol four times b squared end square root symbol.
C. begin square root symbol nine plus a squared minus four times b squared end square root symbol.
D. five minus begin square root symbol sixteen times b end square root symbol minus b squared plus a.