If a-b= 6 and a^2+b^2=100, find the value of ab  Options.
A) 10	B) 32	C) 15	D) 18	E) 19

Rationale: "2 ab = ( a ^ 2 + b ^ 2 ) - ( a - b ) ^ 2 = 100 - 36 = 64 = > ab = 32 answer : b"
Answer: B