Posted by **Krissy ** on Tuesday, January 15, 2013 at 9:33am.

I have a few more questions that I'm not understanding. Its multiple choice however I would appreciate a breakdown on how to solve.

1.Evaluate without a calculator, using the order of operations. -2^2+20-|8-20|-squareroot of 64

a. -36

b. 4

c. 28

d. -4

2.Simplify the expression. Square root of -16

a. 4

b. -4

c. -8

d. Not a real number

- College Algebra -
**Reiny**, Tuesday, January 15, 2013 at 10:27am
-2^2+20-|8-20|-squareroot of 64

= -4 + 20 - 12 - 8

= -4

√-16 ----> not a real number

( in your first one, notice the difference between

-2^2 and (-2)^2 )

- College Algebra -
**Steve**, Tuesday, January 15, 2013 at 10:29am
-2^2+20-|8-20|-√64

-4+20-|-12|-8

-4+20-12-8

-4

(D)

since x^2 >= 0 for all real x,

(D)

√-16 = 4i, a complex number

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