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vodka [1.7K]
3 years ago
5

Kyle is making a frame for a rectangular piece of art. The length of the frame is 3 times the width, as shown below. If Kyle use

s 18 feet of wood to make the frame, what is the length of the frame?

Mathematics
1 answer:
satela [25.4K]3 years ago
3 0

Answer:

———————

6.75 feet |

———————

Step-by-step explanation:

Let the width be x. If the width is x, the the length has to be 3x because in the question it says that the length is 3 times the width.

Since this is a rectangle, the opposite side has the same measure, like in the attachment below.

To find the perimeter, you would add up all the sides.

3x+3x+x+x

=6x+2x

=8x

It is also given in the question that he uses 18 feet. Which means that the perimeter is 18 feet. But you figured out that 8x is ALSO the perimeter. This means that you can say: 8x=18.

Solve for x, 18/8=9/4=2.25.

You want the length, which is 3x. So 3(2.25) is your answer.

3(2.25) = 6.75

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Topic: The Quadratic Formula
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Answer:

Step-by-step explanation:

The quadratic formula for a equation of form

ax²+bx + c = 0 is

x= \frac{-b +- \sqrt{b^2-4ac} }{2a}

For the first equation,

x²+3x-4=0,

we can match that up with the form

ax²+bx + c = 0

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ax² =  x²

divide both sides by x²

a=1

3x = bx

divide both sides by x

3 = b

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. We can match this up because no constant multiplied by x could equal x² and no constant multiplied by another constant could equal x, so corresponding terms must match up.

Plugging our values into the equation, we get

x= \frac{-3 +- \sqrt{3^2-4(1)(-4)} }{2(1)} \\= \frac{-3+-\sqrt{25} }{2} \\ = \frac{-3+-5}{2} \\= -8/2 or 2/2\\=  -4 or 1

as our possible solutions

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Next, we have

x²+3x+4=0

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Plugging 1/2 into 4x²+1=4x, this works as the only solution. This equation has one real solution

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