If a - b = 3 and a(power 2) + b(power 2) = 27, find the value of ab. Choose one
A) 5
B) 9
C) 4
D) 10
E) 3

Rationale: "2 ab = ( a ( power 2 ) + b ( power 2 ) - ( a - b ) ( power 2 ) = 27 - 9 = 18 ab = 9 . answer is b ."
Answer: B