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Furkat [3]
4 years ago
9

What are the solution(s) of x2-4-0?

Mathematics
2 answers:
zaharov [31]4 years ago
7 0

Answer:

<h2>x = -2 or x = 2</h2>

Step-by-step explanation:

x^2-4=0\qquad\text{add 4 to both sides}\\\\x^2-4+4=0+4\\\\x^2=4\iff\sqrt{x^2}=\sqrt4\\\\|x|=2\Rightarrow x=\pm2

Elanso [62]4 years ago
4 0

Answer:

For x^2 - 4 = 0, x  = 2, or x = - 2.

Step-by-step explanation:

Here, the given expression is :

x^2 - 4 = 0

Now, using the ALGEBRAIC IDENTITY:

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

Comparing this with the above expression, we get

x^2 - 4 = 0  = x^2 - (2)^2 = 0\\\implies (x-2)(x+2) = 0

⇒Either (x-2) = 0 , or ( x + 2) = 0

So, if ( x- 2)   = 0 ⇒ x =  2

and if ( x + 2) = 0   ⇒ x = -2

Hence, for x^2 - 4 = 0, x  = 2, or x = - 2.

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Step-by-step explanation:

2/root 9=2/3 = 0.6666666667

8 0
3 years ago
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Brooke collects porcelain dolls and teddy bears. Over the years, the number of porcelain dolls she collected is 14 less than twi
Colt1911 [192]
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5 0
3 years ago
Which two ratios form a proportion?
faust18 [17]

Answer:  

C.) 6:9 and 2:3

It would be C because 6 divided by 3 is 2 and 9 divided by 3 is 3 so it would be  6:9=2:3

7 0
3 years ago
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Is (1,8) a solution to this system of equations?<br> 19x+3y=2<br> 3x+y=11
pantera1 [17]

Answer:

No (1,8) is not a solution to 19x+3y=2.

However, (1,8) is a solution to 3x+y=11.

Step-by-step explanation:

(1,8)

The one represents the x shown in each equation, the eight represents the y.

Substitute the one in for the x and the eight in for the y.

19x+3y=2

19(1)+3(8)

3x+y=11

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Next, solve the equation.

19(1)+3(8) = 43

3(1)+(8) = 11

As you can see, 43 does not equal 2.

But, 11 does equal 11.

7 0
2 years ago
Equivalent ratios<br> I want to know the answer of this
stira [4]
Answer: for 28 copies it will cost $14

Explanation:
The ration 4:2 is equivalent to 1: .5 meaning each copy cost $.5. To determine the cost just multiply the number of copies by .5.
28 x .5 = 14.



7 0
3 years ago
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