The difference between two numbers is 18 & their product is 63. What is the square of their sum?
Show answer & explanation
Correct answer: B
Explanation
Let the two numbers be x and y.
x − y = 18
x × y = 63
(x + y)² = (x − y)² + 4xy
(x + y)² = 18² + 4 × 63
= 324 + 252
= 576