Question

The difference between the square roots of a number is 30. What is the number?

Answer 1

If x is the number,

$\sqrt{x} -(- \sqrt{x} )=30$

(The difference or distance between two numbers is the larger one minus the smaller one.)

$2 \sqrt{x} =30 \\ \sqrt{x} =15 \\ (\sqrt(x))^2=15^2 \\ x=225$