If the sum of two numbers is 42 and their product is 437, then find the
absolute difference between the numbers.
Choose the most appropriate option.
A) 2	B) 4	C) 3	D) 1	E) 0

Rationale: let the numbers be x and y . then , x + y = 42 and xy = 437 x - y = sqrt [ ( x + y ) 2 - 4 xy ] = sqrt [ ( 42 ) 2 - 4 x 437 ] = sqrt [ 1764 – 1748 ] = sqrt [ 16 ] = 4 . required difference = 4 . answer is b .
Answer: B