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

Step-by-step explanation:

we know that

The algebraic expression is equal to

Remember that

and

so

substitute

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step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm