Respuesta :

Sarah06109

Answer:

-63

Step-by-step explanation:

i is equal to √ -1

√ -49

√ 49 * √ -1

7*i

7i

√ -81

√ 81 * √ -1

9*i

9i

7i*9i

63i^2

i^2 equals -1

63*-1

-63

amna04352

Answer:

-63

Step-by-step explanation:

sqrt(-49) = 7i

sqrt(-81) = 9i

7i × 9i

63i²

-63