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anonymous

  • 5 years ago

The length of a rectangle is twice the width. The area is 648yd^2. Find the length and the width.

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  1. darthsid
    • 5 years ago
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    Do you know how to calculate the area of a rectangle? What's the formula for it?

  2. anonymous
    • 5 years ago
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    A=l times w. I set it up this way. Let the length = 2w and the width = w, so with area being 648, the equation is 648=2w(w) correct?

  3. darthsid
    • 5 years ago
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    That's exactly right, nice work!

  4. anonymous
    • 5 years ago
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    Ok, then after I come up with 648=2w^2, I get lost!! Do I square both sides?

  5. darthsid
    • 5 years ago
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    No, you first divide both sides by two to get 324=w^2

  6. darthsid
    • 5 years ago
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    Now, to find w, you have to take the square root of both sides

  7. anonymous
    • 5 years ago
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    Ok, then I square both sides?

  8. darthsid
    • 5 years ago
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    ok let me explain a little: Squaring sides means raising it to the power of two (multiplying by itself twice) so, square of w is w^2 Square root means the reverse of the above. So you need to take the square root of the sides

  9. anonymous
    • 5 years ago
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    Ok, so it would be the square root of 324=w

  10. darthsid
    • 5 years ago
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    Exactly!

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