217 * 217 + 183 * 183
Choose the most appropriate option:
A) 70578
B) 82578
C) 80578
D) 80568
E) 89045
Explanation:   1/2×2(a2+b2)=1/2×[(a+b)2+(a−b)2]   =1/2×[(217+183)2+(217−183)2]=80578   Option 80578
<result>C</result>
217 * 217 + 183 * 183