if a - b = 3 and a ( power 2 ) + b ( power 2 ) = 25 , find the value of ab .
2 ab = ( a ( power 2 ) + b ( power 2 ) - ( a - b ) ( power 2 ) = 25 - 9 = 16 ab = 8 . answer is b .
divide(subtract(25, power(3, 2)), 2)