1^2 – 2^2 + 3^2 – 4^2 + 5^2 – 6^2 + 7^2 – 8^2 + 9^2 – 10^2=?  Pick.
A) -21 B) -53 C) -35 D) -55 E) -58
1-4+9-16+25-36+49-64+81-100= -55   ANSWER:-55
<result>D</result>
1^2 – 2^2 + 3^2 – 4^2 + 5^2 – 6^2 + 7^2 – 8^2 + 9^2 – 10^2=?