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alassen

  • 3 years ago

Simplify the expression: √-108 + √-27

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  1. alassen
    • 3 years ago
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    Choices: A. -3√15 B. 3i√15 C. 9i√3 D. -9√3

  2. cwrw238
    • 3 years ago
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    look for perfect squares in the factors of each number eg √-27 = √3 * √-9 = 3i √3 now do a similar process with √-128

  3. alassen
    • 3 years ago
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    biggest perfect square in 128 is 16

  4. touseii45
    • 3 years ago
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    |dw:1365030037227:dw|

  5. cwrw238
    • 3 years ago
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    √-108 = √4 * √27i = 6i √3 so adding them gives 9i √3

  6. alassen
    • 3 years ago
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    Thank You

  7. cwrw238
    • 3 years ago
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    C is correct option

  8. cwrw238
    • 3 years ago
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    sorry i wrote 128 instead of 108

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