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anonymous

  • one year ago

factor 9u^2+42u+49 Please help! D:

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  1. welshfella
    • one year ago
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    Hint: this is a perfect square take the square roots of the first and last terms

  2. anonymous
    • one year ago
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    3 and 7?

  3. anonymous
    • one year ago
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    oh 45u+7?

  4. welshfella
    • one year ago
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    the 7 is right ( well its + 7) but dont forget the u^2

  5. anonymous
    • one year ago
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    OK so now what now that i have45u+7?

  6. welshfella
    • one year ago
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    its not 5u - what is the square root of 9u^2

  7. anonymous
    • one year ago
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    3u. but i added that to the 42u and got 45u

  8. welshfella
    • one year ago
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    - no you cant do that these trinomials ( also called quadratics) factor out to the form (a + b)(c + d) in this case its (a + b)(a + b) where the middle term = 2ab in this case 2ab = 42u

  9. anonymous
    • one year ago
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    oh im kind of confused...

  10. welshfella
    • one year ago
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    |dw:1433688118015:dw|

  11. welshfella
    • one year ago
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    first the a multiplies the second bracket then the b does the same

  12. anonymous
    • one year ago
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    OH!! So I need the 2 parts to equal the original equation?

  13. welshfella
    • one year ago
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    yes

  14. anonymous
    • one year ago
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    Okay I get it now I think :)

  15. welshfella
    • one year ago
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    so the factors are ?

  16. welshfella
    • one year ago
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    ( 3u + 7)( 3u + 7)

  17. anonymous
    • one year ago
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    thank you! :)

  18. anonymous
    • one year ago
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    so its (3u+7)^2?

  19. welshfella
    • one year ago
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    yes

  20. anonymous
    • one year ago
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    Thank you :3 I get it now

  21. welshfella
    • one year ago
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    yw

  22. anonymous
    • one year ago
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    Also can you help me with one more?

  23. anonymous
    • one year ago
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    9-4z^2 that would be (3-2z)^2?

  24. anonymous
    • one year ago
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    multiply it out and check

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