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V125BC [204]
3 years ago
12

Simplify the expression -4x2(3x − 7)

Mathematics
2 answers:
Anna007 [38]3 years ago
5 0
-4x2(3x-7)
multiply -4 and 2
-8(3x-7)
distribute the -8
-24x+56
Paul [167]3 years ago
5 0
Its  -12x^3+28x^2 hope it helps 
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the perimeter of a rectangle is 90 inches. The width of the rectangle is 13 inches less than the length of the rectangle. Find t
Rama09 [41]

Answer:

The area of the rectangle is 2820 square inches. The length is 60 inches. The width is 47 inches.

Step-by-step explanation:

Since we know the equation to find the width, we have to set them both to the perimeter of 90 inches. We will use the variable <em>x</em> to represent the length.

    <em>x + x - 30 = 90</em>

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<em />

You would then subtract 30 from both sides.

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Divide by 2 on both sides, finding that the length (x) is 30 inches.

<em>     x = 30 inches.</em>

<em></em>

Then, subtract 13 inches from the length to find your width.

    <em>60 - 13 = 47 inches</em>

<em />

To find your area, you would multiply both of your factors (length and width) together.

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<em />

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