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IrinaVladis [17]
3 years ago
9

Prove using identities A minus A intersection B = A-B

Mathematics
1 answer:
andrew-mc [135]3 years ago
4 0
B= A-B
B+B=A
2B=A
B=A/2
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I am really bad at Math, does anyone know how many solutions are in these 1. 2x - x + 7 = x +3 + 4 2. -2(x + 1) = -2x + 5 3. 4x
timama [110]

Step-by-step explanation:

1. 2x - x + 7 = x +3 + 4

Collecting like terms;

2x - x - x = 3 + 4 - 7

2x = 0

x = 0

2. -2(x + 1) = -2x + 5

Expanding the bracket;

- 2x - 2= - 2x + 5

Collecting like terms;

- 2x + 2x = 5  + 2

0 = 7

It has no solution

3. 4x + 2x + 2 = 3x - 7

Collecting like terms;

4x + 2x + 3x = - 7 -2

9x = -9

x = -1

4. 4(2x + 1) = 5x + 3x + 9

Expanding the bracket

8x + 4 = 5x + 3x + 9

Collecting like terms

8x - 5x - 3x = 9 - 4

0 = 5

It has no solution

5. X + 2x + 7 = 3x - 7

Collecting like terms

x + 2x - 3x = - 7 - 7

0 = - 14

It has no solution

3 0
3 years ago
The end points of the diameter of a
SCORPION-xisa [38]
Find the diameter of circle using pythagoras
d = √(Δx² + Δy²)
d = √((7-1)² + (-6-2)²)
d = √(6² + (-8)²)
d = √100
d = 10
The diameter is 10

Find the circumference
c = π × d
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c = 31.4
5 0
3 years ago
In how many ways can a three-member committee be chosen from a group of twelve?
Trava [24]
12*11*10 ways
your welcome
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7 0
3 years ago
X-y=1 <br> X+y=3 Elimination
Mila [183]
X-y=1
x+y=3
You see the y's can cancel out. So add it together and you have:
2x=4
x=2
Now that you have x, plug it in to one of the equations to find y.
I will plug it into the first one.
(2)-y=1
-y=-1
y=1

5 0
3 years ago
How to Find the product of 68 x 37
slava [35]

Answer:

our answer will be: 68 x 37 = 2516. To find any product in the future on your own, just remember that ...

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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