Question

Please help.
Simplify the expression using imaginary numbers.
√ -49 * √ -81

Answer 1

-63

Explanation:

sqrt(-49) = 7i

sqrt(-81) = 9i

7i × 9i

63i²

-63

Answer 2

-63

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