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MAVERICK [17]
3 years ago
10

Factorise:x^2-y^2-x-y​

Mathematics
1 answer:
ivanzaharov [21]3 years ago
7 0

9514 1404 393

Answer:

  (x -y -1)(x +y)

Step-by-step explanation:

The expression can be factored by grouping.

  x^2 -y^2 -x -y = (x^2 -y^2) -(x +y)

  = (x -y)(x +y) -1(x +y)

  = (x -y -1)(x +y)

_____

It is useful to know that a difference of squares is factored as ...

  a^2 -b^2 = (a -b)(a +b)

You might be interested in
Can someone plzz help me with these 2 questions. thanks!
Deffense [45]

9514 1404 393

Answer:

  4. height: 5√3 cm; area: 25√3 cm²

  5. 30√2 ft ≈ 42.43 ft

Step-by-step explanation:

4. The height of an equilateral triangle is (√3)/2 times the side length, so is ...

  height = (√3)/2 × (10 cm) = 5√3 cm

The area is given by the formula ...

  A = 1/2bh

  A = 1/2(10 cm)(5√3 cm) = 25√3 cm²

__

5. The diagonal of a square is √2 times the side length, so the distance from 3rd to 1st base is ...

  (30 ft)√2 ≈ 42.43 ft

__

The length of the diagonal of a square is something you should be familiar with. If you're not, you can figure the distance using the Pythagorean theorem.

  d = √(30² +30²) = √1800 ≈ 42.43 . . . feet

6 0
2 years ago
20. The perimeter of a square is 72 in. What is its area?
ivanzaharov [21]

The formula for perimeter is length + length + width + width

You know that all the sides of a square are equal to each other. That means that all the values in the perimeter formula should be the same. Therefore you can divide 72 by 4 (perimeter divided by the number of sides)

72 / 4 = 18

^^^Each side is 18 in

The formula for are is...

A = length x width

so...

18 * 18 = 324

324 in^2

Hope this helped!

~Just a girl in love with Shawn Mendes

6 0
3 years ago
The instructions on the bag of concrete mix say to add 2 gallons of water to each 8 pound bag of concrete mix.
SVETLANKA909090 [29]

Answer:

B

Step-by-step explanation:

The ratio of water to mix is 1:4.

3 0
3 years ago
What is the first step to 7(x – 4) = 84.
ss7ja [257]
Parenthesis according to the PEMDAS rule

So
7(x - 4) = 84

Would be

7x -28 = 84


Hope this helped :)
5 0
3 years ago
Read 2 more answers
How do you solve 2 (+-1) =24<br> solve 2(+-1) =24
ExtremeBDS [4]

Answer:

2 + (-1) = 24

2-1 = 24

1=24????????????

Step-by-step explanation:

7 0
3 years ago
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