Answer:

1) positive and negative 13

2) 49 - 15 = 34

Step-by-step explanation:

196^(1/2)

√196 = (+)(-)13

7x7 = 49

7(-√15)= -7√15

7(√15) = 7√15

-7√15 + 7√15 = 0

(√15)(-√15)= -(√225) = -15

49 - 15 = 34