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moongazer

  • 2 years ago

How do you solve this ? the fastest way possible :)

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  1. moongazer
    • 2 years ago
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    38n^2 + 304n - 128 = -2n^2

  2. moongazer
    • 2 years ago
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    Please help :)

  3. Hero
    • 2 years ago
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    1. Add 2n^2 to both sides first

  4. moongazer
    • 2 years ago
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    please continue :)

  5. moongazer
    • 2 years ago
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    I got 40n^2 + 304n - 128 = 0

  6. Hero
    • 2 years ago
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    2. Factor out 8

  7. moongazer
    • 2 years ago
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    8(5n^2 + 38n - 32)

  8. Hero
    • 2 years ago
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    You forgot the equal zero part

  9. moongazer
    • 2 years ago
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    8(5n^2 + 38n - 32) = 0

  10. Hero
    • 2 years ago
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    3. Divide both sides by 8

  11. moongazer
    • 2 years ago
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    w8 I think I got something wrong

  12. Hero
    • 2 years ago
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    32 x 8 = 256 That definitely isn't right

  13. Hero
    • 2 years ago
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    Did you figure out what you did wrong yet?

  14. moongazer
    • 2 years ago
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    it should be 8(5n^2 + 38n - 16) right?

  15. Hero
    • 2 years ago
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    equal zero :/

  16. Hero
    • 2 years ago
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    You keep forgetting the equal zero

  17. moongazer
    • 2 years ago
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    ok, I'll just try to solve it. I think I am getting confused because I divided 128 by 8 wrongly :) I'll just ask you if am I stuck with some part :)

  18. moongazer
    • 2 years ago
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    8(5n-2)(n+8)=0 (5n-2)(n+8)=0 n=2/5 , n=-8 Is this correct?

  19. moongazer
    • 2 years ago
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    Thanks! I believe it is correct :)

  20. Hero
    • 2 years ago
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    It's correct. Good job

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spraguer (Moderator)
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