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fenix001 [56]
3 years ago
7

What are the solutions of the equation x4 – 5x2 – 36 = 0? use factoring to solve.

Mathematics
2 answers:
Paul [167]3 years ago
8 0
X^4 - 5x^2 - 36 = 0
(x^2 - 9)(x^2 + 4) = 0  - factor the left side
(x + 3)(x - 3)(x^2 + 4) = 0 - factor (x^2 - 9 as difference of squares)
x + 3 = 0    x - 3 = 0    x^2 + 4 = 0  Set each factor to 0 if any 0 the left side 0
x = -3         x = 3         x^2 = -4
                                   x = 2i or -2i
The roots are 3, -3, 2i, -2i  (Don't know if you need the imaginary roots but I gave you them anyway)
Dmitry [639]3 years ago
8 0
Well if the equation looks like this x^{4} -5 x^{2}-36=0 then you would have four quite long answers.
x=
2.98707487
-2.98707487
1.98055958i
-1.98055958i

The last two have and i at the end for imaginary. Those four numbers would be your answer.
Hope this helps! Don't forget Brainliest! :)
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Helpppo:)))))) pleaseeee
velikii [3]

Answer:

32

Step-by-step explanation:

Step 1: Define

f(x) = 3x² - 5x - 4

g(x) = -4x - 12

Step 2: Find f(g(x))

f(g(x)) = 3(-4x - 12)² - 5(-4x - 12) - 4

f(g(x)) = 3(16x² + 96x + 144) + 20x + 60 + 4

f(g(x)) = 48x² + 288x + 432 + 20x + 64

f(g(x)) = 48x² + 308x + 496

Step 3: Find f(g(-4))

f(g(-4)) = 48(-4)² + 308(-4) + 496

f(g(-4)) = 48(16) - 1232 + 496

f(g(-4)) = 768 - 736

f(g(-4)) = 32

3 0
2 years ago
Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left after 17,190 years?
kow [346]

17,190 / 5,730 = 3. This means we must divide 70mg in half 3 times

70 / 2 = 35

35 / 2 = 17.5

17.5 / 2 = 8.75

There will be 8.75 mg left after 17,190 years.

7 0
3 years ago
Please help me! I will mark brainliest. Also, the perimeter is 36 feet.​
Lynna [10]
9 feet? Not sure lmk if I'm wrong other people answering
8 0
2 years ago
Read 2 more answers
Jaewon is 5 feet 3 inches tall. How many inches tall is Jaewon? O A. 53 inches B60 inches OC. 63 inches oc O D. 96 inches​
nadezda [96]

Answer:

First, we determine how many inches in the board. (5 x 12) + 3. This gives you 63 total inches. You want three equal pieces so you divide 63 by 3 and the answer is 21 inches for each individual piece.

Step-by-step explanation:

First, we determine how many inches in the board. (5 x 12) + 3. This gives you 63 total inches. You want three equal pieces so you divide 63 by 3 and the answer is 21 inches for each individual piece.

8 0
2 years ago
What is 4g=24?................
Gnesinka [82]
4g = 24

First, divide both sides by 4. / Your problem should look like: g = \frac{24}{4}
Second, simplify \frac{24}{4} to 6. / Your problem should look like: g = 6

Answer: g = 6

4 0
3 years ago
Read 2 more answers
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