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01.08.2019 •
Mathematics
Which of the quadratic functions has the narrowest graph? y= -2x^2, y= 1/2x^2, y= 1/7x^2, y= -4x^2
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Ответ:
Explanation:
The coefficient of the quadratic term tells you how much the graph of the given function is stretched vertically (widen horizontally) compared with the parent function (in this case f(x) = x^2).
These are the cases. Given y = Ax^2, for A ≠ 0,
- if |A| > 1, the function is stretched vertically; this is the graph of Ax^2 is narrower than the graph of the parent function, x^2.
- if |A| < 1, the function is stretched horizontally, this is the graph is wider than the graph of x^2.
The greater |A| the narrower the graph.
That is because for the same x-value, f(x) is further of the y-axis as |A| is greater.
So, you conclude that the function f(x) = - 4x^2 is the narrowest function (it is strectched the most) among the choices.
Of course, you can see it if you draw the graphs of the 4 functions in the same coordinate system.
Ответ:
x=sqrt30^2-25^2 b.) 16.58
Step-by-step explanation: