College Algebra

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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 -

    -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 -

    -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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