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diamondeye10

the product of two consecutive positive even numbers is 1520. What are the numbers? when I try "n" and "n+2" i get an odd number

  • one year ago
  • one year ago

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  1. JakeV8
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    you can express those consecutive even numbers like "n" and "n+2" and their product is (n)(n+2) = 1520

    • one year ago
  2. satellite73
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    guess and check for this one there is no other way

    • one year ago
  3. satellite73
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    \(40\times 42=1680\) nope, too big. try again with smaller numbers

    • one year ago
  4. JakeV8
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    That's not quite the right equation...

    • one year ago
  5. satellite73
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    @Albert0898 it is the PRODUCT not the sum

    • one year ago
  6. satellite73
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    you cannot use an equation to solve this, only to rewrite the question, don't be fooled you just have to grind it until you find it

    • one year ago
  7. bahrom7893
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    38 and 40

    • one year ago
  8. bahrom7893
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    satellite was close ;)

    • one year ago
  9. bahrom7893
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    hahah, sorry i used your guess to approximate.

    • one year ago
  10. satellite73
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    yeah a calculator helps i started too high, went down a couple, got it in try two

    • one year ago
  11. JakeV8
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    n(n+2) = 1520 n^2 + 2n - 1520 = 0 (n-38)(n+40) = 0 Since the numbers are positive, the 2nd solution doesn't work. n must be 38 and n + 2 is 40.

    • one year ago
  12. JakeV8
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    (I couldn't factor that as easily as I made it sound... so a calculator helped me too :) )

    • one year ago
  13. tcarroll010
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    You definitely do not have to grind it out and guess. But the equation is not shown correctly above. It is (2N)(2N + 2) = 1520. Becomes a simple quadratic. Solve for N. Answer will be the 2N and 2N + 2.

    • one year ago
  14. satellite73
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    so my question is, how did you know how to factor ? you had to come up with two numbers whose product is 1520 and that are two apart in other words just rewrote the question, still had to guess and check

    • one year ago
  15. Albert0898
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    x = even number x + 2 = consecutive even number x + 2 * x = 1520 x + 2 = 1520/x x = 1518/x x * x = 1518 Find the square root of 1518. Approximate and Closest Even Number: 38. x = 38 x + 2 = 40

    • one year ago
  16. satellite73
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    i guess if you wanted to be ridiculous you could write \[x^2+2x=1520\] and complete the square \[(x+1)^2=1521\] \[x+1=\sqrt{1521}=39\]\[x=38\] but that is a silly thing to do

    • one year ago
  17. JakeV8
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    @satellite73 Yes, I agree with you... that's what I meant... you either guess and check to factor, or just guess and check vs. 1520. My only point was that it is possible to write an equation to solve something like this.

    • one year ago
  18. satellite73
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    @JakeV8 yes you are right, but i maintain that changing a problem like this in to an equation and then solving it by solving the original problem in words is a dog chasing its tail

    • one year ago
  19. tcarroll010
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    You guys are missing it all together. Set the variables as 2N and 2N + 2. If you set N to a positive integer, 2N and 2N + 2 are automatically even. Becomes a simple quadratic. See my previous post.

    • one year ago
  20. diamondeye10
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    thanks all I think I found my problem

    • one year ago
  21. tcarroll010
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    Ok, I'm here. Give me a second to refresh myself on this.

    • one year ago
  22. tcarroll010
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    Ok, I'm up to speed. I still stand firmly on my answer methodology. The way to GUARANTEE that you have two even numbers is to use (2N)(2N + 2) = 1520 because 2N and 2N + 2 will be FORCED to be even if N is a positive integer. Absolutely. I strongly suggest you use this methodology. If I understand, your current question has something to do with 3 positive even numbers now? Is that correct?

    • one year ago
  23. tcarroll010
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    And please, whatever you do, don't follow satellite73 on this problem. He is WAY off base suggesting that you guess. That's beyond ludicrous.

    • one year ago
  24. diamondeye10
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    @tcarroll010, that is the equation I was using however, i am still unable to find two positive even numbers. No I do not have to find three evennumbers, I was seeing if the way I was working it would give even numbers for three. hope that makes sence, sorry my computer is slow. . I only need two positive even numbers

    • one year ago
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