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aev [14]
3 years ago
5

Multiply: (4x – 7)(2x – 9)

Mathematics
2 answers:
ra1l [238]3 years ago
5 0
<span><span>(<span><span>4x</span>−7</span>)</span><span>(<span><span>2x</span>−9)
</span></span></span><span>=<span><span>(<span><span>4x</span>+<span>−7</span></span>)</span><span>(<span><span>2x</span>+<span>−9</span></span>)
</span></span></span><span>=<span><span><span><span><span>(<span>4x</span>)</span><span>(<span>2x</span>)</span></span>+<span><span>(<span>4x</span>)</span><span>(<span>−9</span>)</span></span></span>+<span><span>(<span>−7</span>)</span><span>(<span>2x</span>)</span></span></span>+<span><span>(<span>−7</span>)</span><span>(<span>−9</span>)
</span></span></span></span><span>=<span><span><span><span>8<span>x2</span></span>−<span>36x</span></span>−<span>14x</span></span>+63
</span></span><span>=<span><span><span>8<span>x2</span></span>−<span>50x</span></span>+<span>63</span></span></span>
harina [27]3 years ago
4 0
Hello there!


Let's use foil.

First: 4x * 2x = 8x^2

Outside: 4x * -9 = -36x

Inside: -7 * 2x = -14x

Last: -7 * -9 = 63

Now, let's combine these.

8x^2 - 36x - 14x + 63

Finally, we can simplify this

8x - 50x + 63



I hope I helped!

Let me know if you need anything else!

~ Zoe
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Make an equation.  \frac{7+7+2+2}{10}

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Find the altitude of a cylinder with with a radius of 9 and a surface area of approximately 791.68 units2.
Vika [28.1K]

In this question , it is given that we have a cylinder with with a radius of 9 and a surface area of approximately 791.68 units square.

The formula of surface area of cylinder is

A= 2 \pi r^2 + 2 \pi r h

Substituting the values of A and r, we will get

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Here is a rectangle which has a width of x cm. x cm
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Answer:

278.25 cm2

Step-by-step explanation:

If the width of the rectangle is x (cm), as the length is 8cm longer, so that the length of the rectangle is: x + 8 (cm).

In the attached image, we can see the length of each side. Total length of the sides are 90 cm.

=> (x + x + 8) + x + 8 + (x+8) + (x + x + 8) + x + 8 + (x +8) = 90

=> 8x + 48 = 90

=> 8x = 90 - 48 = 42

=> x =42/8 = 5.25 (cm)

=> The width of the rectangle is 5.25cm

=> The length of the rectangle is: 5.25 + 8 = 13.25 cm

=> The area of one rectangle is: Length x Width = 5.25 x 13.25 = 69.5625 cm2

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Area of 8 sided shape = 4 x Area of the rectangle = 4 x 69.5625 = 278.25 cm2

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