what is the sum of two consecutive even numbers , the difference of whose squares is 84 ?
let the numbers be x and x + 2 . then , ( x + 2 ) 2 - x 2 = 84 4 x + 4 = 84 4 x = 80 x = 20 . the required sum = x + ( x + 2 ) = 2 x + 2 = 42 . answer a 42
add(divide(subtract(84, multiply(const_2, const_2)), multiply(const_2, const_2)), add(divide(subtract(84, multiply(const_2, const_2)), multiply(const_2, const_2)), const_2))