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3 years ago

The value of (a+b)² - (a-b)² is

Mathematics

1 answer:

ANEK [815]3 years ago

5 0

Answer:

4ab

Step-by-step explanation:

(a+b)^2-(a-b)^2

=a^2 + 2ab + b^2 -(a^2 - 2ab +b^2)

=a^2 + 2ab + b^2 - a^2 + 2ab - b^2

=2ab + 2ab

=4ab

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3 years ago

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Genrish500 [490]

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3 years ago

Hexagonal tiles of side 20 cm are used to tile a room which measures 6.25 m by 4.85 m. Assuming we complete the edges by cutting

ch4aika [34]

Answer: 292 tiles

Step-by-step explanation:

To find the number of tiles needed , we need to know the area of the hexagonal tiles and also the area of the room.

<u>Area of hexagon</u>

The area of hexagon is given as :

Area = $\frac{3\sqrt{3}}{2}$ $a^{2}$

Where a is the length of side.

Therefore:

A = $\frac{3\sqrt{3}}{2}$ $20^{2}$

A = $\frac{3\sqrt{3}}{2}$ X 400

A = (400 x 3 x $\sqrt{3}$ ) / 2

A = $\frac{2078.460969}{2}$

A = 1039.23 $cm^{2}$

Also to find the area of the room , we must first convert from m to cm

6.25 m = 6.25 x 100 cm

6.25m = 625 cm

4.85m = 485cm

Therefore: Area of the room = length x breadth

Area = 625 x 485

Area = 303125 $cm^{2}$

Therefore , the number of tiles needed = area of the room / area of hexagon

Number of tiles = 303125/ 1039.23

N = 291.6823032

Therefore , the number of tiles needed ≈ 292

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4 years ago

Share £747 in the ratio 2:7 between tom and ben

kondor19780726 [428]

Answer:

Really hope this helps

Step-by-step explanation:

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Ben= £522.90

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3 years ago

Scientific notation The table shows the amount of money raised by each region the four regions used a total of $ (5.38×10^4) How

Serggg [28]

9514 1404 393

Answer:

$8.65×10^3

Step-by-step explanation:

The amount the West raised is the difference between the total and the sum of the other amounts raised. It is convenient to use a multiplier of 10^4 for each of the numbers, so the number for South can be rewritten as 0.675×10^4.

West = 5.38×10^4 -1.46×10^4 -2.38×10^4 -0.675×10^4

= (5.38 -1.46 -2.38 -0.675)×10^4

= 0.865×10^4 = 8.65×10^3

West raised $8.65×10^3.

_____

Your calculator can figure this for you. You can set the final display to scientific notation format, if you need to.

3 0

3 years ago

The value of (a+b)² - (a-b)² is​

The value of (a+b)² - (a-b)² is