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ethanyayger
06.05.2021 •
Mathematics
The first term of an arithmetic sequence is -4. The 5th term is 16. What is the common difference of the arithmetic sequence?
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Ответ:
correct answer is option 3:
Step-by-step explanation:
Given that
Ellipse passes through coordinates:
Points inside ellipse (5, 0) and (-5,0).
Given the options:
Let us try to put the coordinates in the options and check which equation gets satisfied.
Putting x = 0, and trying to find out y in option 1.
But, the points are![\approx (5\dfrac{1}{2},0),\approx (-5\dfrac{1}{2},0), \approx (0,2)\ and\ \approx (0,-2)](/tpl/images/0706/6799/d9344.png)
So, option (1) is false.
Putting x = 0 to find y in option 2.
y will have imaginary values so ellipse not possible at x = 0.
So, option (2) is false.
Putting x = 0 to find y in option 3.
Putting y = 0 to find y in option 3.
So, the points
are satisfied.
Putting (5, 0) and (-5,0) in LHS of option 3:
i.e. both the points are inside ellipse.
Hence correct answer is option 3: