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Daniel [21]
3 years ago
14

What are the real and complex solutions of the polynomial equation x^4+3x^2-4

Mathematics
1 answer:
Lyrx [107]3 years ago
5 0

Answer: (D) -1,1,-2i,2i

Explanation:

x^4+3x^2-4 = 0\\x^2 \rightarrow z\\z^2 + 3z -4 = 0 \\z_1 = -4\\z_2 = 1\\x_{1,2} = \pm\sqrt{-4}=\pm 2 i\\x_{3,4} = \pm 1

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The top speed of a wildebeest is 64 km/h and the top speed of a zebra is 64.4 km/h. How much faster is a zebra in feet per secon
7nadin3 [17]
The first thing we must do is subtract both speeds.
 We have then:
 64.4 km / h - 64.0 km / h = 0.40 km / h
 We now change units taking into account the following conversions:
 1h = 3600s
 1km = 3280.84 feets
 We have then:
 0.40 * (3280.84 / 3600) = 0.364537778 feet / s
 Answer: 
 a zebra is faster 0.364537778 in feet per second
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3 years ago
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What is the answer 12 x 12
aleksandr82 [10.1K]

12 × 12 would equal to 144

Hope this helped! :D

8 0
3 years ago
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If I buy a stereo for $245 and this includes GST of 10%, what is the pre-GST price?
Ivan

Answer:  $222.73

===========================================

Work Shown:

x = pre-GST price

10% of x = 0.10x = tax amount

x + 0.10x = 1.10x = post-GST price = 245

1.10x = 245

x = 245/1.10

x = 222.7272 approximately

x = 222.73 is the price before tax.

------------

Check:

10% of 222.73 = 0.10*222.73 = 22.273 = 22.27

The tax amount ($22.27) is added to the pre-GST price to get

22.27+222.73 = 245

which matches the post-GST price mentioned.

The answer is confirmed.

Or another way to confirm the answer is to calculate this

1.10*222.73 = 245.003 = 245

6 0
2 years ago
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GarryVolchara [31]

the answer is true i think

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4 years ago
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3 pizzas for $24.99_______________ cost of each pizza
Lena [83]

Answer:

$8.33

Step-by-step explanation:

24.99 ÷ 3 = 8.33

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3 years ago
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