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algol [13]
3 years ago
9

Send it quick guys...

Mathematics
1 answer:
yanalaym [24]3 years ago
4 0

Answer:

(7 + 4√3)² + (7 - 4√3)² = 194

Step-by-step explanation:

* Lets explain how to solve the problem

∵ a² + b² = (7 + 4√3)² + (7 - 4√3)²

- Lets solve each bracket alone then add the two answers

# Remember (a + b)² = (a)² + 2(a)(b) + (b)²

∵ (7 + 4√3)² = (7)² + 2(7)(4√3) + (4√3)²

∵ 7² = 49

∵ 2(7)(4√3) = 2 × 7 × 4 × √3 = 56√3

∵ (4√3)² = (4)² × (√3)² = 16 × 3 = 48

∴ (7 + 4√3)² = 49 + 56√3 + 48

- 49 and 48 are like terms

∴ (7 + 4√3)² = 97 + 56√3 ⇒ (1)

# Remember (a - b)² = (a)² - 2(a)(b) + (b)²

∵ (7 - 4√3)² = (7)² - 2(7)(4√3) + (4√3)²

- All the numbers like the first bracket except the middle sign, then

 all the answer will be the same except the middle sign will be (-)

∴ (7 - 4√3)² = 49 - 56√3 + 48

∴ (7 - 4√3)² = 97 - 56√3 ⇒ (2)

- lets add answers (1) and (2)

∴ (7 + 4√3)² + (7 - 4√3)² = 97 + 56√3 + 97 - 56√3

∴ (7 + 4√3)² + (7 - 4√3)² = (97 + 97) + (56√3 - 56√3)

∵ 97 + 97 = 194

∵ 56√3 - 56√3 = 0

∴ (7 + 4√3)² + (7 - 4√3)² = 194

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Step-by-step explanation:

For this, you would use the point slope formula, which is (y-y1)=m(x-x1). x1 and y1 are the coordinates from the ordered pair.

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y-2=3x-12

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To check, you can plug the coordinates into the equation.

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3 years ago
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A rectangle has a length that is 5 meters greater than the width. If w represents the width, write an expression, in terms of w,
ahrayia [7]

Answer:

Area of rectangle is w^2+5w

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Step-by-step explanation:

Given:

Let the width of the rectangle be 'w'.

Also Given:

A rectangle has a length that is 5 meters greater than the width.

Length of rectangle = w+5\ meters

We need to write expression for Area of rectangle and Perimeter of rectangle.

Solution:

Now we know that;

Perimeter of rectangle is equal to twice the sum of the length and width.

framing in equation form we get;

Perimeter of rectangle = 2(w+5+w)=2(2w+5) =4w+20

Also We know that;

Area of rectangle is length times width.

framing in equation form we get;

Area of rectangle= w(w+5) = w^2+5w

Hence Area of rectangle is w^2+5w and Perimeter of Rectangle is 4w+20.

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Can someone please help me with this geometry?
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Answer:

(see below)

Step-by-step explanation:

A reflection across the y-axis is the same thing, but just mirrored on the other side. In this case, "the other side" is the y-axis.

The original rectangle was two units away from the y-axis, so this new rectangle needs to be as well.

Its area needs to also be 2 units big.

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Refer to the image below:

5 0
3 years ago
Write an equation for an ellipse centered at the orgin, which has foci ( plus minus 3, 0) and co-vertices at (0, plus minus 4)
Vadim26 [7]

Answer:

The answer is below

Step-by-step explanation:

The co-vertices of an ellipse are the endpoints of the minor axis. The equation for an ellipse is given by:

\frac{(x-h)^2}{a^2} +\frac{(y-k)^2}{b^2}=1

Where (h, k) is the center of the ellipse, (h, k±b) is the co-vertices, (h ± a, k) is the vertices, (h ± c, k) is the foci and c² = a² - b²

Since the center is the origin, hence (h, k) = (0, 0). i.e h = 0, k = 0.

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co-vertices = (h, k±b)  = (0, ±b)  = (0, ±4). b = 4

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Therefore the equation of the ellipse is:

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6 0
3 years ago
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