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Llana [10]
2 years ago
14

Which of the following expressions is equivalent to (2x + 3)(x2 – 7)?

Mathematics
2 answers:
balu736 [363]2 years ago
7 0

You didn't give any choices but I am still going to solve this.

First let's separate this a little bit.

(2x+3)(x^2-7)

=2x(x^2-7)+3(x^2-7)

Now we can multiply these in again.

=2x^3-14x+3x^2-21

=2x^3+3x^2-14x-21

miv72 [106K]2 years ago
5 0

Step-by-step explanation:

what are the following expressions????

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Step-by-step explanation:

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Solve the equation: <br> -3p + 10 = 1 for p
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The length of a rectangle is 4 ft longer than its width.
son4ous [18]

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96

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40=4x+8

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marta [7]

Answer:

A) Length = 110.4 mm and width = 62.1 mm

B) A = 6855.84 mm²

C) length = 114.7 mm

width = 55.8 mm

Area = 6400.26 mm²

D) Screen with aspect ratio of 16:9 is bigger

Step-by-step explanation:

A) We are told that the aspect ratio of the phone screen = 16:9. This means that the ratio of the length to the width of the screen is 16:9.

To find the side length, we will say that;

length = 16x

width = 9x

Thus, since the edges are perpendicular, then we can use pythagoras theorem since we know that the diagonal is 127 mm

Thus;

(16x)² + (9x²)] = 127²

256x² + 81x² = 16129

337x² = 16129

x² = 16129/337

x = √(16129/337)

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width = 9x = 9 × 6.9 = 62.1 mm

Length = 110.4 mm and width = 62.1 mm

B) area of screen is;

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A = 110.4 × 62.1

A = 6855.84 mm²

C) We are told that the aspect ratio is now 18.5:9.

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width = 9x

Thus;

(18.5x)² + (9x²)] = 127²

342.25x² + 81x² = 16129

423.25x² = 16129

x² = 16129/423.25

x = √(16129/423.25)

x = 6.2

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width = 9x = 9 × 6.2 = 55.8 mm

Area = 114.7 × 55.8 = 6400.26 mm²

D) Screen with aspect ratio of 16:9 is bigger

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Answer:

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