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lidiya [134]
3 years ago
7

Cynthia besch wants to buy a rug for a room that is 23ft wide and 26ft long. She wants t ok leave a uniform strip of floor aroun

d the rug. She can only afford t ok buy 270 square feet of carpeting. What dimensions should the rug have?
Mathematics
1 answer:
Lostsunrise [7]3 years ago
6 0

Answer:

Dimension of rug is (15\times 18)\ ft

Step-by-step explanation:

Given: Area of rug= 270 ft²

           Cynthia besch wants to buy a rug for a room that is 23ft wide and 26ft long.

Let´s assume the uniform strip size of floor around rug be "x".

As given, Cynthia wants to leave a uniform strip of floor around the rug.

∴ Rug dimension will be (23-2x)\times (26-2x)

We know, area of rectangle= width\times length

Forming an equation for area of rug.

⇒270= (23-2x)\times (26-2x)

Now solving the equation to find the dimension of rug.

270= (23-2x)\times (26-2x)

Using distributive property of multiplication.

⇒ 270= 598-46x-52x+4x^{2}

⇒ 598-98x+4x^{2}= 270

Subtracting both side by 270

⇒ 4x^{2}-98x+328= 0

using quadratic formula to solve the equation.

⇒  Formula: \frac{-b\pm \sqrt{b^{2}-4(ac) } }{2a}

∴ In the expression , we have a= 4, b= -98 and c= 328.

Now, subtituting the value in the formula.

= \frac{-(-98)\pm \sqrt{-98^{2}-4(4\times 328) } }{2\times 4}

= \frac{98\pm \sqrt{9604-4(1312) } }{8}

Opening parenthesis.

= \frac{98\pm \sqrt{9604-5248 } }{8}

= \frac{98\pm \sqrt{4356}}{8}

We know 66²=4356  and √a²=a  or -a

= \frac{98\pm 66}{8}

= \frac{98+66}{8}\ or \ \frac{98-66}{8}

= 20.5 \ or\  4

∴ Value of x will be either 20.5 ft or 4 ft

Ignoring decimal value, therefore taking value of x is 4 ft

Subtituting the value of x to find the dimension of rug.

Width of rug= (23-2x)

⇒ Width of rug= 23- 2\times 4

⇒ Width of rug= 23-8= 15\ ft

Next, Length of rug= (26-2x)

⇒ Length of rug= (26-2\times 4)

⇒ Length of rug= 26-8= 18\ ft

Hence, dimension of rug is (15\times 18)\ ft

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