All categories

3 years ago

What are the solutions of x^2 - 4 = 0

Mathematics

2 answers:

diamong [38]3 years ago

7 0

It is a difference of squares, so we can factor this to

$(x+2)(x-2)=0$

Then, we can solve for $x$ .

$x=-2,2$

Hope this helps.

頑張って!

Gennadij [26K]3 years ago

7 0

Answer:

x = ± 2 i

Step-by-step explanation:

Explanation:

subtract 4 on both sides to get

−

Take the square root of both sides to get

You might be interested in

700% of what number is 4,340?

Luden [163]

Answer:

620

Step-by-step explanation:

100% must be the the answer so 700% must be 7 times that number.

4340÷7=620

7 0

2 years ago

Read 2 more answers

X+3=2X+6(x+4)<br> Please Answer!

nataly862011 [7]

X=10
-3 on both sides
Then -6(x+4)+3 to the other side

4 0

2 years ago

5-4x-8y How many TERMS are present in this expression? 2. How many TERMS are present in this expression? List them: List them: I

Sphinxa [80]

Answer:

2 terms the terms are x and y

7 0

2 years ago

Read 2 more answers

HELPPO ME PLEASEE!!!!!!

ElenaW [278]

Answer:

Here,

x + 25° + 3x + 95° + 80°=360° (Sum of angles of a quadrilateral is 360°)

or,x+3x + 25° + 95° + 80° =360°

or,4x + 200 = 360°

or,4x = 360 - 200

or,4x = 160

or,x = 160÷4

or,x = 40

Now,

Angle K = (x + 25)° = 40 + 25° = 65°

Angle L = 3x° = 3 × 40° = 120°

4 0

2 years ago

Carl bought 19 apples of 2 different varieties to make a pie.The total cost of the apple was $5.10.Granny Smith apples cost $0.2

disa [49]

For this case we propose a system of equations:

x: Let the variable representing the quantity of Granny Smith apples

y: Let the variable representing the number of Gala apples

According to the statement we have:

$x + y = 19\\0.25x + 0.30y = 5.10$

From the first equation we have to:

$x = 19-y$

replacing in the second equation:

$0.25 (19-y) + 0.30y = 5.10\\4.75-0.25y + 0.30y = 5.10\\4.75 + 0.05y = 5.10\\0.05y = 5.10-4.75\\0.05y = 0.35\\y = \frac {0.35} {0.05}\\y = 7$

So, Carl bought 7 Gala apples

On the other hand:

$x = 19-7 = 12$

So, Carl bought 12 Granny Smith apples

Answer:

Carl bought 7 Gala apples and 12 Granny Smith apples

8 0

2 years ago