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anonymous

  • one year ago

Solve 4r2 – 9 = 91. A. {± 3} B. {± 4} C. {± 5} D. {±6}

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  1. Vocaloid
    • one year ago
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    add 9 to both sides divide both sides by 4 take the square root of each side

  2. anonymous
    • one year ago
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    4r^2=100

  3. anonymous
    • one year ago
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    @Vocaloid

  4. Vocaloid
    • one year ago
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    alright, so you added 9 to each side what's the next step?

  5. anonymous
    • one year ago
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    r^2=25

  6. Vocaloid
    • one year ago
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    good, what's the next step?

  7. anonymous
    • one year ago
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    r^2=5

  8. anonymous
    • one year ago
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    @Vocaloid

  9. Vocaloid
    • one year ago
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    not quite, check the left side

  10. anonymous
    • one year ago
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    im not sure what to do to the left side!

  11. Vocaloid
    • one year ago
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    hint: the square root of a^2 = a so what is the square root of r^2?

  12. anonymous
    • one year ago
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    r=5

  13. Vocaloid
    • one year ago
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    you're very close! when we take the square root of something, the answer can be either positive or negative, which is why|dw:1432835682334:dw|

  14. Vocaloid
    • one year ago
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    now, what do you think the answer is?

  15. anonymous
    • one year ago
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    c?

  16. Vocaloid
    • one year ago
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    yup, excellent job ~

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