{"id":3537,"date":"2021-07-28T18:43:21","date_gmt":"2021-07-28T18:43:21","guid":{"rendered":"https:\/\/mathemerize.com\/?p=3537"},"modified":"2021-11-24T16:13:29","modified_gmt":"2021-11-24T10:43:29","slug":"what-is-the-domain-and-range-of-modulus-function","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/what-is-the-domain-and-range-of-modulus-function\/","title":{"rendered":"What is the Domain and Range of Modulus Function"},"content":{"rendered":"
Here, you will learn modulus function and what is the domain and range of modulus function.<\/p>\n
Let’s begin –<\/p>\n
The function f(x) defined by<\/p>\n
\ny = |x| = \\(\\begin{cases} x & \\text{if}\\ x \\ge 0 \\\\ -x & \\text{if}\\ x < 0 \\end{cases}\\)<\/p>\n<\/blockquote>\n
is called the modulus function.<\/p>\n
It is also called absolute value function.<\/p>\n
we observe that the domain of the modulus function is the set R of all real numbers and the range is the set of all non-negative real numbers.\u00a0<\/p>\n
Domain and Range of Modulus Function<\/h2>\n
For f(x) = |x|,<\/p>\n
\nDomain<\/strong> is R<\/p>\n
Range<\/strong> is [0,\\(\\infty\\)]<\/p>\n<\/blockquote>\n
The graph of the modulus function is as shown in figure, for x > 0, the graph coincides with the graph of the identity function i.e. the line y = x and for x > 0, it is coincident to the line y = -x,\u00a0<\/p>\n
The modulus function has the following properties :<\/p>\n
(i) For any real number x, we have<\/p>\n
\\(\\sqrt{x^2}\\) = |x|<\/p>\n
For example, \\(\\sqrt{cos^2x}\\)\u00a0 = | cos x |\u00a0 = \\(\\begin{cases} cos x ,\u00a0 & 0 \\ge x \\le \\pi\/2 \\\\ -cos x , & \\pi\/2 < x \\le \\pi \\end{cases}\\)<\/p>\n
(ii) If a, b are positive real numbers, then<\/p>\n
\\(x^2\\) \\(\\le\\) \\(a^2\\) \\(\\iff\\) |x| \\(\\le\\) a \\(\\iff\\) -a \\(\\le\\) x \\(\\le\\) a<\/p>\n
\\(x^2\\) \\(\\ge\\) \\(a^2\\) \\(\\iff\\) |x| \\(\\ge\\) a \\(\\iff\\) x \\(\\le\\) -a or, x \\(\\ge\\) a<\/p>\n
\\(x^2\\) < \\(a^2\\) \\(\\iff\\) |x| < a \\(\\iff\\) -a < x < a<\/p>\n
\\(x^2\\) > \\(a^2\\) \\(\\iff\\) |x| > a \\(\\iff\\)\u00a0 x < -a or, x > a<\/p>\n
\\(a^2\\) \\(\\le\\) \\(x^2\\) \\(\\le\\) \\(b^2\\) \\(\\iff\\) a \\(\\le\\) |x| \\(\\le\\) b \\(\\iff\\) x \\(\\in\\) [-b, -a] \\(\\cup\\) [a, b]<\/p>\n
\\(a^2\\) < \\(x^2\\) < \\(b^2\\) \\(\\iff\\) a < |x| < b \\(\\iff\\) x \\(\\in\\) (-b, -a) \\(\\cup\\) (a, b)<\/p>\n
(iii) For any real number x and y, we have<\/p>\n
| x + y | = | x | + | y |, if (x \\(\\ge\\) 0 and y \\(\\ge\\) 0) or, (x < 0 and y < 0)<\/p>\n
| x – y | = | x | – | y |, if (x \\(\\ge\\) 0 and | x | \\(\\ge\\) | y |) or, (x \\(\\ge\\) 0 and y \\(\\le\\) 0 and | x | \\(\\ge\\) | y |)<\/p>\n
| x \\(\\pm\\) y | \\(\\le\\) | x | + | y |<\/p>\n
| x \\(\\pm\\) y | > | | x | – | y | |<\/p>\n
Hope you learnt what is the domain and range of modulus function, learn more concepts of function\u00a0and practice more questions to get ahead in the competition. Good luck!<\/p>\n\n\n