If a-b= 8 and a^2+b^2=164, find the value of ab
Choose the correct choice from the following:
A) 10
B) 12
C) 50
D) 18
E) 19

Rationale: 2 ab = ( a ^ 2 + b ^ 2 ) - ( a - b ) ^ 2 = 164 - 64 = 100 = > ab = 50 answer : c
Answer: C