need help in finding out g(-2) when g(x)= sqrt 5-x + 2. 



x = -2, then substitute



    g(-2)= sqrt (5-(-2) + 2)

         = sqrt (5+2+2)

         = sqrt 9

         = 3



Another question is sqrt -36 the same as -sqrt 36. would answer still be 6i? 



            sqrt -36 is not the same as - sqrt 36

Why? sqrt (-36) = sqrt (36 * -1)

                = sqrt 36 * sqrt (-1)

                = 6 sqrt (-1)  Remember that sqrt (-1) = i

                = 6i



While - sqrt 36 = - 6









One last question: sqrt -36 divided by sqrt -9. Is answer -2? 



                  sqrt -36

                ____________

                  sqrt -9



            



                 sqrt 36 * -1)

               ________________

                 sqrt (9 * -1)







               sqrt 36 * sqrt (-1)

              ____________________

               sqrt 9 * sqrt (-1) 

              



                  6i

                ______

                  3i



                  2 * 

                 ________

                   





                 2 

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