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muminat
3 years ago
5

For all real numbers a and b, 2a • b = a2 + b2 True Or False ! Explain

Mathematics
2 answers:
Aliun [14]3 years ago
7 0
This is true only if one of a or b is negative
(a-b)^2 is 0
a^2+b^2-2ab=0
a^2+b^2=2ab

(A-b)^2 is 0
if a-b=0
cluponka [151]3 years ago
6 0
This may be equal with this formula of 

(a-b)^2 = a^2 -2ab +b^2
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A(3, -1) and B(6, 0)
Mashutka [201]

Answer:

AB = 3.16 units

Step-by-step explanation:

Given:

A(3, -1) and B(6, 0)

To Find:

AB = ?

Solution:

AB = root{(x2 - x1)^2 + (y2 - y1)^2}

AB = root{(6 - 3)^2 + (0 - (-1))^2}

AB = root{(3)^2 + (0 + 1)^2}

AB = root{9 + (1)^2}

AB = root{9 + 1}

AB = root 10

Therefore, AB = 3.16 units

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6 0
3 years ago
Which graph represents the function f (x) = 3 x minus 2 Over x minus 2?
RSB [31]

Answer:

C

Step-by-step explanation:

4 0
2 years ago
A government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted
mylen [45]

let n be the number of times letter be found (1800), p be the success rate (0.068), and q be the failure rate (1 - 0.068 = 0.932)  

mean = np = 1800 x 0.068 = 122.4  

standard deviation = √(npq) = √(1800 x 0.068 x 0.932) = 10.6807414

4 0
3 years ago
I'll give brainlist for you if you help me
MAXImum [283]

Answer:

the period of this graph is 2\pi

Step-by-step explanation:

The period is the length of the section that repeats.  So for this graph, we need to calculate the distance between 2 peaks or 2 troughs of the curve.

Let's look at the peaks (maximums).

One is at x = 0 and the next is at x = 2\pi

2\pi - 0 = 2\pi

Therefore, the period of this graph is 2\pi

6 0
2 years ago
A paved walkway around a garden has an outer diameter of 80 ft and an inner diameter of 40 ft. A diagram is shown below.
k0ka [10]

Given:

  • Outer diameter = D = 80 ft
  • Inner diameter = d = 40 ft

So,

Outer radius = R = D/2

=> R = (80 ft)/2

=> R = 40 ft

Inner radius = r = d/2

=> r = (40 ft)/2

=> r = 20 ft

Area of paved pathway = πR² - πr²

= π(R² - r²)

= π(R + r)(R - r)

= π(40 + 20)(40 - 20) ft²

= π(60)(20) ft²

= 3.14 * 1200 ft²

= 3768 ft²

6 0
2 years ago
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