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son4ous [18]
3 years ago
7

Find the real zeros x4-11x2+18=0

Mathematics
1 answer:
masya89 [10]3 years ago
6 0

Answer:

x=√2, x=-√2, x= 3 and x=-3

Step-by-step explanation:

We need to solve the equation x^4 - 11x^2+18=0

We can replace x^4 = u^2 and x^2 = u

So, the equation will become

u^2 -11u+18 = 0

Factorizing the above equation:

u^2 -9u-2u+18 =0

u(u-9)-2(u-9)=0

(u-2)(u-9)=0

u=2, u=9

As, u = x^2, Putting back the value:

x^2 =2 , x^2 =9

taking square roots:

√x^2 =√2 ,√x^2=√9

x=±√2 , x = ±3

so, x=√2, x=-√2, x= 3 and x=-3

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marissa [1.9K]

Answer:

The circumference of a circle is approximately three times its diameter. If you divide the circumference by its diameter, the constant ratio is called Pi, which is an irrational number shown with this symbol: For example, the circle below has a radius of 4.5 inches.

Step-by-step explanation:

Hope this helps!

Brain-List?

4 0
3 years ago
In Nadias DVD collection she has eight action DVDs 12 comedy DVDs seven romance DVDs and three science fiction DVDs what percent
Evgesh-ka [11]

Please state the full question what percent of what DVD in her collection we dont have enough information to give you an answer, I will just list all the possible answers,

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Possible answers

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7 0
3 years ago
· f(x)= x2 - 49<br> Identify the number of zeros of the polynomial function
Dominik [7]

Answer:

x = -7, x = 7

Step-by-step explanation:

Firstly, you are going to set the equation to 0, and then factor it.

Set equation to 0 -----> f(x)= x^2 - 49 will become x^2 - 49 = 0

Now, you're going to factor the equation.

You'll get (x-7) (x+7) upon factoring.

Thirdly, you will set (x-7)(x+7) equal to 0 and also solve for x.

Keep in mind that you'll be treating them as two separate equations

So, ----> (x-7) = 0 (x+7) = 0

When you solve for the x, you'll find out that x is equal to 7 and -7 ---> these are your zeros.

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3 years ago
Can I please have help on 9
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