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3 years ago

If the area of a rectangle with length (4x) is 4x2 + 12x, find the width.

Mathematics

1 answer:

8090 [49]3 years ago

3 0

Answer:

The width of a rectangle is: w = x+3

Step-by-step explanation:

Given

The length of rectangle = l = 4x

The area of rectangle = A = 4x² + 12x

To determine

The width of rectangle = w = ?

We know that the formula of the area of the rectangle is

$A = wl$

substitute A = 4x² + 12x and l = 4x in the equation to determine the width w of the rectangle

4x² + 12x = w×4x

w = [4x² + 12x] / [4x]

Factor 4x² + 12x: 4x(x+3)

w = [ 4x(x+3) ] / [4x]

w = x+3

Therefore, the width of a rectangle is: w = x+3

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Step by step:
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3 years ago

For what value of x does (x + 3)^2-5=0

ArbitrLikvidat [17]

Answer:

x = -3±sqrt( 5)

Step-by-step explanation:

(x + 3)^2-5=0

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(x + 3)^2-5+5=0+5

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3 years ago

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Westkost [7]

Answer:

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2 years ago

If the area of a rectangle with length (4x) is 4x2 + 12x, find the width.​

If the area of a rectangle with length (4x) is 4x2 + 12x, find the width.