Question

Simplify the expression. Write your answer as a complex number.

5 times the square root of 9 minus the square root of negative 64

8 + 8i
8 − 8i
15 + 8i
15 − 8i

Answer 1

15-8i

Explanation:

Answer 2

`15-8i`

Explanation:

we know that

The algebraic expression is equal to

`5√(9)-√(-64)}`

Remember that

`√(9)=3`

and

`i=√(-1)`

so

`√(-64)=i√(64)=8i`

substitute

`5√(9)-√(-64)}=5(3)-(8i)=15-8i`