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maxonik [38]
3 years ago
13

What are the solutions of the equation x^4-9x^2+8=0? Use u substitution to solve

Mathematics
2 answers:
krok68 [10]3 years ago
7 0
Exact Form:
x
=
2
√
2
,
−
2
√
2
,
−
1
,
1
x
=
2
2
,
-
2
2
,
-
1
,
1
Decimal Form:
x
=
2.82842712
…
,
−
2.82842712
…
,
−
1
,
1
Liula [17]3 years ago
7 0

Answer with Step-by-step explanation:

We have to solve the equation:

x^4-9x^2+8=0

let u=x²

u²-9u+8=0

⇒ u²-8u-u+8=0

⇒ u(u-8)-1(u-8)=0

⇒ (u-8)(u-1)=0

⇒ u=8 or u=1

⇒ x²=8 or x²=1

⇒ x=2√2 or x=-2√2 or x=1 or x=-1

Hence, Solution of x^4-9x^2+8=0 is:

x=2√2 ,-2√2,1 and-1

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Answer:

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Step-by-step explanation:

Here, we want to solve the system of equation using elimination method

We have this as follows;

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5 0
3 years ago
I need help (asap)! #5-8
7nadin3 [17]
5) 1.1802 x 10^6
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3 years ago
What is 219956784+7275579182÷4×6
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4 0
3 years ago
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A machining operation produces bearings with diameters that are normally distributed with mean 3.0005 inches and standard deviat
padilas [110]

Answer:

5%

Step-by-step explanation:

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Since the mean is 3.0005 and the standard deviation is s=0.0010, 2s=0.0020, 95% of the data should fall between [3.0005-0.0020, 3.0005+0.0020] and 5% outside this interval. So <em>around 5% of total production will be scrap</em>.

 

7 0
3 years ago
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