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Evgen [1.6K]
3 years ago
7

The perimeter of a picture frame is 24 inches. If the width of the picture frame is 5 inches, what is the length of the picture

frame?
Mathematics
2 answers:
Fofino [41]3 years ago
8 0

The answer is (8x+36) inches

Zarrin [17]3 years ago
3 0
L=7
2l+2w=24
2l+2x5=24
2l+10=24
2l=14
l=7
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When the sum of \, 528 \, and three times a positive number is subtracted from the square of the number, the result is \, 120. F
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Let x be the unknown number. So, three times that number means 3x, and the square of the number is x^2

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Then, we have to subtract this number from x^2, so we have

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x_{1,2} = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

If you plug the values from your equation, you have

x_{1,2} = \dfrac{3\pm\sqrt{9-4\cdot(-648)}}{2} = \dfrac{3\pm\sqrt{9+2592}}{2} = \dfrac{3\pm\sqrt{2601}}{2} = \dfrac{3\pm51}{2}

So, the two solutions would be

x = \dfrac{3+51}{2} = \dfrac{54}{2} = 27

x = \dfrac{3-51}{2} = \dfrac{-48}{2} = -24

But we know that x is positive, so we only accept the solution x = 27

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Step-by-step explanation:

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