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Algebra2

posted by on .

Help Please?

1.30√-25 x 8√-49

2. 6√-64 + 12√-36

3. 4√-13 - 6√-13

  • Algebra2 - ,

    30√-25 x 8√-49
    = 30√25√-1 x 8√49√-1
    =150√-1 x 56√-1
    = 8400 (-1)
    = -8400 , remember that √-1 x √-1 = i x i = i^2 = -1

    do the others the same way, let me know what you got

  • Algebra2 - ,

    I'm Doing Problem 2 Right Now .
    But I'm Stuck How Did You Get 150 In the 3rd Line?

  • Algebra2 - ,

    30√25√-1 x 8√49√-1
    = 30 x 5 x √-1 x 8 x 7 x √-1
    = 150 x √-1 x 56 x √-1
    = 8400 x i^2
    = ....

  • Algebra2 - ,

    Oh Okay .
    I Tried The Other Two Problems.
    For #1 I Got 120 As My Answer.
    For #2 I Got 37 As My Answer.

  • Algebra2 - Sara - ,

    Nope:

    6√-64 + 12√-36 = 6*8i + 12*6i = 120i

    4√-13 - 6√-13 = (4-6)√-13 = -2√13 i

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