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anonymous

  • one year ago

The width w of a rectangular swimming pool is 7x2. The area A of the pool is 7x3 – 42x2. What is an expression for the length of the pool? Show your work.

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  1. Mehek14
    • one year ago
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    \(\dfrac{7x^3-42x^2}{7x^2}\)

  2. Mehek14
    • one year ago
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    do you know how to divide this?

  3. anonymous
    • one year ago
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    Do i divide the the numerators with the same denominator? If so i think i can

  4. anonymous
    • one year ago
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    because 7 can only be divided by 7 once

  5. Mehek14
    • one year ago
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    yes like this \(\dfrac{7x^3}{7x^2}\)

  6. Mehek14
    • one year ago
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    correct so 7/7 = 1 how about \(\dfrac{x^3}{x^2}\)

  7. anonymous
    • one year ago
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    Think it's just x

  8. Mehek14
    • one year ago
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    correct

  9. Mehek14
    • one year ago
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    now \(\dfrac{42x^2}{7x^2}\)

  10. anonymous
    • one year ago
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    Is it 6, 6+x = 6x @Mehek14

  11. Mehek14
    • one year ago
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    so the length is \(x+6\)

  12. anonymous
    • one year ago
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    Okay had it written wrong Thanks Mehek14

  13. Mehek14
    • one year ago
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    \((7x^2)(x+6) = 7x^3 + 42x^2\)

  14. Mehek14
    • one year ago
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    wait it's -6

  15. anonymous
    • one year ago
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    Oh? how did it get negative?

  16. Mehek14
    • one year ago
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    \(7x^2*(x-6)=7x^3-42x^2\)

  17. Mehek14
    • one year ago
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    because -42/7 = -6

  18. anonymous
    • one year ago
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    Oh, didn't notice the 42 was negative i would of been way off

  19. Mehek14
    • one year ago
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    me neither :P

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