Maths-
General
Easy

Question

Number of ordered pairs (a, x) satisfying the equation sec squared space left parenthesis a plus 2 right parenthesis x plus a squared minus 1 equals 0 semicolon minus pi less than x less than pi is

  1. 1
  2. 2
  3. 3
  4. 4

hintHint:

In this question, we have written the ordered pair of (a, x) of equation sec2 (a + 2) x + a2 -1 = 0. And interval is –π < x < π . We know that sec2 x-1 = tan2x, use this formula into this question and solve the following.

The correct answer is: 3


    Here we have to write the order pair of (a, x).
    Firstly, we have given equation,
    equals greater than s e c squared left parenthesis a plus 2 right parenthesis x plus a squared minus 1 equals 0
    equals greater than t a n squared left parenthesis a plus 2 right parenthesis x plus a squared equals 0 left square bracket s i n c e comma s e c squared x minus 1 equals t a n squared x right square bracket
    Both terms must be zero, so we can write,
    t a n squared left parenthesis a plus 2 right parenthesis x equals 0 space a n d space a squared equals 0
    t a n squared 2 x equals 0 space space space space space space space space space space space space space space space space space space space space space space space space left square bracket s i n c e comma a squared equals 0 t h e n a equals 0 right square bracket
    x space equals space 0 space comma space pi space comma space minus space pi
    But it's not possible because π , - π are open interval so value no include, so we can write,
    x space equals space 0 space comma space pi over 2 space comma space minus space pi over 2
    we have to write the pair of (a, x) which is:
    left parenthesis space 0 space comma space 0 space right parenthesis space comma space left parenthesis space 0 space comma space pi over 2 space right parenthesis space comma space left parenthesis space 0 space comma space minus straight pi over 2 right parenthesis
    Hence, there are 3 ordered pair.
    Therefore, the correct answer is 3.

    In this question, we have to find the ordered pair of (a, x). For that solve the equation. Here, sec2x-1 = tan2x. Remember these terms and solve the problem.

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