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Explain big oh notation in brief. Find big oh of the following function:f(x) = 5x4 + 9x2 + 7x + 9.

Question

Explain big oh notation in brief. Find big oh of the following function:

f(x) = 5x^4 + 9x^2 + 7x + 9.

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Solution

Big O notation is a mathematical notation that describes the limiting behavior of a function when the argument tends towards a particular value or infinity. In computer science, it is used to classify algorithms according to how their running time or space requirements grow as the input size grows.

Big O notation characterizes functions according to their growth rates: different functions with the same growth rate may be represented using the same O notation.

The letter O is used because the growth rate of a function is also referred to as the order of the function. A description of a function in terms of big O notation usually only provides an upper bound on the growth rate of the function.

Now, let's find the Big O of the function f(x) = 5x^4 + 9x^2 + 7x + 9.

When determining the Big O of a function, we're interested in the term that grows the fastest as x approaches infinity. In this case, the term that grows the fastest is 5x^4. The other terms (9x^2, 7x, and 9) become insignificant as x grows larger and larger.

Therefore, we can say that the function f(x) = 5x^4 + 9x^2 + 7x + 9 is O(x^4). This means that the growth rate of the function is proportional to the fourth power of x.

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