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anonymous

  • one year ago

The area of a rectangle is 120 cm2. The length of the rectangle is eight less than the twice of the width. Find the dimensions of the rectangle.

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  1. anonymous
    • one year ago
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    so far i got....\[(2x - 8) *w=120 \right?\]

  2. anonymous
    • one year ago
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    x=w

  3. anonymous
    • one year ago
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    let width=x length=2x-8 x(2x-8)=120

  4. anonymous
    • one year ago
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    ok so i was right

  5. anonymous
    • one year ago
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    yes

  6. anonymous
    • one year ago
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    so... \[2x ^{2} - 8x -120=0\]

  7. anonymous
    • one year ago
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    carry on

  8. anonymous
    • one year ago
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    hmnmmmm

  9. anonymous
    • one year ago
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    divide by 2

  10. anonymous
    • one year ago
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    solve further

  11. anonymous
    • one year ago
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    ok

  12. anonymous
    • one year ago
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    what can i add to get 4 that i can multiply to get 60? hmm

  13. anonymous
    • one year ago
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    10 and 6

  14. anonymous
    • one year ago
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    x-6, and x-10?

  15. anonymous
    • one year ago
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    1*- 60=-60 10-6=4 10*-6=-60

  16. anonymous
    • one year ago
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    x-6, and x-10? ?

  17. anonymous
    • one year ago
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    \[x^2-\left( 10-6 \right)x-60=0\] \[x^2-10x+6x-60=0\]

  18. anonymous
    • one year ago
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    thats what i got

  19. anonymous
    • one year ago
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    \[x(x-10) 6(x-10)\]

  20. anonymous
    • one year ago
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    good

  21. anonymous
    • one year ago
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    6 cm and 20 cm 10 cm and 12 cm 40 cm and 30 cm 5 cm and 24 cm

  22. anonymous
    • one year ago
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    oh multiply by 2

  23. anonymous
    • one year ago
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    right?

  24. anonymous
    • one year ago
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    12 and 20?

  25. anonymous
    • one year ago
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    x(x-10)+6(x-10)=0 (x-10)(x+6)=0 x+6=0,x=-6 rejected x-10=0,x=10 width=10 length=2*10-8=20-8=12

  26. anonymous
    • one year ago
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    where does 8 come from?

  27. anonymous
    • one year ago
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    oh i see

  28. anonymous
    • one year ago
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    kinda?

  29. anonymous
    • one year ago
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    in the statement length is 8 less than twice width

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