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allea_marie

  • 3 years ago

How do you solve 5x² - 20x² (GCF)

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  1. AravindG
    • 3 years ago
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    GCF means?

  2. AravindG
    • 3 years ago
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    -15x^2

  3. CheetahBooks1
    • 3 years ago
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    GCF means Greatest Common Factor.

  4. CheetahBooks1
    • 3 years ago
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    Am I right?

  5. AravindG
    • 3 years ago
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    @allea_marie reply pls

  6. CheetahBooks1
    • 3 years ago
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    Hello?

  7. scarydoor
    • 3 years ago
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    There needs to be more here, for there to be something to solve.

  8. allea_marie
    • 3 years ago
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    Yes it stands for Greatest Common Factor

  9. scarydoor
    • 3 years ago
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    so what are the two numbers that you want to find the greatest common factor of?

  10. CheetahBooks1
    • 3 years ago
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    But why do you need GCF to solve this? It is quite simple. Just subtract 5-20 and carry over the x^2. That would be -15x^2

  11. allea_marie
    • 3 years ago
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    Okay thanks, how would you solve 2x² - 21x=54

  12. scarydoor
    • 3 years ago
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    that one can be solved by factorising the polynomial.

  13. scarydoor
    • 3 years ago
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    \[ 2x^2 - 21x =54 \] \[2x^2 - 21x - 54 = 0 \] Now you want to solve: \[(2x + a)(x +b) = 2x^2 - 21x - 54 \] Note that you must have \[ a*b = -54 \]

  14. scarydoor
    • 3 years ago
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    this won't always work so easily. But I can see here that it does.

  15. allea_marie
    • 3 years ago
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    Okay thank you

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