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Nimfa-mama [501]
3 years ago
12

(X+2y)(x-2y) how do I solve this

Mathematics
1 answer:
Fudgin [204]3 years ago
5 0

Step-by-step explanation:

(x+2y)(x-2y)

  • x^2-2xy+2xy-(2y)^2
  • x^2-4y^2

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Convert (5, pi/6) to rectangular coordinates
kupik [55]
Polar coordinates are written as the distance of the point to the origin and its angle of elevation around the unit cirlce.

Draw a right triangle with an angle of \frac{\pi}6 and a hypotenuse with a length of 5.

You can use trigonometric ratios to find the legs of this triangle, which are the x and y coordinates of the point.

\cos=\frac{adj}{hyp} \\\\ \cos(\frac{\pi}6)=\frac{x}5 \\\\ \frac{\sqrt{3}}2=\frac{x}5 \\\\ \frac{5\sqrt{3}}2=x

As for y...

\sin=\frac{opp}{hyp}\\\\\sin(\frac{\pi}6) = \frac{y}5 \\\\ \frac{1}2=\frac{y}5 \\\\ \frac{5}2=y

\boxed{(\frac{5\sqrt{3}}2,\ \frac{5}2)}

3 0
3 years ago
My new cell phone cost me $190.00 but when I signed a 2 year plan, I got
Gala2k [10]

Answer:

$304.00

Step-by-step explanation:

20% of $190.00 is 38

$190.00 - 38 = $152.00

$152.00 + $152.00 = $304.00 or $152.00 x 2 = $304.00

5 0
3 years ago
For the following system, use the second equation to make a substitution for y in the first equation.
ICE Princess25 [194]

Answer:

It is A

Step-by-step explanation:

2x + y = 5

y + 3 = 2x

From equation 2:

y = 2x - 3

Substituting in the first equation:

2x + 2x - 3 = 5.

5 0
3 years ago
Given: ΔXYZ AB is a midsegment parallel to XY. The slope of AB is 2 3 . What is the slope of XY?
Bezzdna [24]
The slope of XY is the same as the slope of AB because AB is parallel to XY and parallel lines have the same slope.
7 0
4 years ago
Read 2 more answers
How do you convert this mixed fraction 8 21/40 into a decimal
klemol [59]
8\frac{21}{40}=8\frac{21\cdot5}{40\cdot5}=8\frac{105}{200}=8\frac{105\cdot5}{200\cdot5}=8\frac{525}{1000}=\boxed{8.525}
7 0
3 years ago
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