If a - b = 3 and a(power 2) + b(power 2) = 25, find the value of ab.  Choose the most appropriate option
A) 5 B) 8 C) 4 D) 10 E) 3

Rationale: 2 ab = ( a ( power 2 ) + b ( power 2 ) - ( a - b ) ( power 2 ) = 25 - 9 = 16 ab = 8 . answer is b .
Answer: B