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anonymous

  • 5 years ago

factors of 3528 that add up to 23?

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  1. myininaya
    • 5 years ago
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    so we have xy=3528 and x+y=23. solve the sum for either x or y

  2. myininaya
    • 5 years ago
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    if you solve for y: y=23-x, so xy=x(23-x)=3528

  3. myininaya
    • 5 years ago
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    but now we have -x^2+23x=3528 so we didn't get anywhere because we still have to come up with factors of 3528 that add up to be 23. Do you know the quadratic formula?

  4. anonymous
    • 5 years ago
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    its a trinomial. i have to factor it, but i couldnt find any thing to pull out. heres the equation: \[63a^2+23ab-56b^2\]

  5. myininaya
    • 5 years ago
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    oh factors of -3528 that add up to be 23 one sec

  6. myininaya
    • 5 years ago
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    ok so i normally make a little tree and move numbers around and I got 72(-49)=-3528 and 72+(-49)=23

  7. anonymous
    • 5 years ago
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    ohhhh okay i see what i did wrong. having the negative right?

  8. myininaya
    • 5 years ago
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    right

  9. anonymous
    • 5 years ago
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    okayy i see, thank you!

  10. myininaya
    • 5 years ago
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    np

  11. anonymous
    • 5 years ago
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    so when i do it i write it as...

  12. anonymous
    • 5 years ago
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    \[63a^2+79ab-41ab-5b^2\]

  13. myininaya
    • 5 years ago
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    63a^2+72ab-49ab-5b^2 or 63a^2-49ab+72ab-5b^2

  14. anonymous
    • 5 years ago
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    okay cool, thanks!

  15. myininaya
    • 5 years ago
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    well that 5 is suppose to be 56 in both cases

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