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Dcherry1996

  • 3 years ago

It's been so long since I've done these; how do I solve 7x^2-72x+81?

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  1. blahblah_who_cares
    • 3 years ago
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    Well what do you remember?

  2. blahblah_who_cares
    • 3 years ago
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    Like do you remember the general equation?

  3. dumbcow
    • 3 years ago
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    how long has it been :)

  4. dumbcow
    • 3 years ago
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    i programmed the quadratic formula into my calculator to do these real quick

  5. blahblah_who_cares
    • 3 years ago
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    nice. I would do the same, but i dont because it wont help me later on @dumbcow

  6. blahblah_who_cares
    • 3 years ago
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    Are you there? @Dcherry1996

  7. Dcherry1996
    • 3 years ago
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    Yes sorry I mean I remember this... |dw:1358139387150:dw|

  8. Dcherry1996
    • 3 years ago
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    But not what to do if there's a number in front of the x^2

  9. mominanisar
    • 3 years ago
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    it doesn't matter if you use quadratic formula

  10. blahblah_who_cares
    • 3 years ago
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    Ok. Sorry I had to leave. But the general equation is ax^2+bx+c So you get a*c. And you cut the bx into 2 numbers that add up to your a*c. Then you will eventually end up with (x+something)(x+something). And your answers are whatever makes the equation zero.

  11. Dcherry1996
    • 3 years ago
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    ^^ I understand that much, but what do I do if there's a number in front of the x^2?

  12. blahblah_who_cares
    • 3 years ago
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    Hero has shown it and he is a great teacher on this site.

  13. Dcherry1996
    • 3 years ago
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    Just saw that, hang on let me go through that

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