If a-b= 10 and a^2+b^2=150, find the value of ab  Choose the correct choice:
A) 10	B) 12	C) 25	D) 18	E) 19

Rationale: "2 ab = ( a ^ 2 + b ^ 2 ) - ( a - b ) ^ 2 = 150 - 100 = 50 = > ab = 25 answer : c"
Answer: C