The value of the expression $5^{2}-4^{2}+3^{2}$ is
(A) 20
(B) 18
(C) 21
(D) 10
(E) 16
The value of the expression $5^{2}-4^{2}+3^{2}$ is
(A) 20
(B) 18
(C) 21
(D) 10
(E) 16

Solution

$5^{2}=25,4^{2}=16,3^{2}=9$

Thus, $5^{2}-4^{2}+3^{2}=25-16+9=18$.

ANSWER: (B)