Respuesta :

devishri1977

Answer:

Step-by-step explanation:

To find the value of x, using Pythagorean theorem.

7) x² = 12² + 12²

        = 144 + 144

       = 288

x     = √2*12*12

x = 12√2

8) x² + 9² = 18²

x² + 81 = 324

x² = 324 - 81

x² = 243

x = √3*9*9

x = 9√3