15 more than a number squared is 19

2

Step-by-step explanation:

x²+15 = 19

x²       = 19 - 15

x²       = 4

x         = 2

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x