Maths-
General
Easy

Question

If P open parentheses 1 plus fraction numerator alpha over denominator square root of 2 end fraction comma 2 plus fraction numerator alpha over denominator square root of 2 end fraction close parentheses be any point on a line then the range of  for which the point ' P ' lies between the parallel lines x+2y=1 and 2x+4y=15 is

  1. fraction numerator negative 4 square root of 2 over denominator 3 end fraction less than alpha less than fraction numerator 5 square root of 2 over denominator 6 end fraction
  2. 0 less than alpha less than fraction numerator 5 divided by square root of 2 over denominator 6 end fraction
  3. fraction numerator negative 4 square root of 2 over denominator 3 end fraction less than alpha less than 0
  4. None of these

hintHint:

When a point is existing in between two lines the product of it's values with respect to the point will always gives negative. Because, the the property of a line with respect to point changes for two lines.

The correct answer is: fraction numerator negative 4 square root of 2 over denominator 3 end fraction less than alpha less than fraction numerator 5 square root of 2 over denominator 6 end fraction


    Given That:
    If P open parentheses 1 plus fraction numerator alpha over denominator square root of 2 end fraction comma 2 plus fraction numerator alpha over denominator square root of 2 end fraction close parentheses be any point on a line then the range of  for which the point ' P ' lies between the parallel lines x+2y=1 and 2x+4y=15 is
    >>> When a point lies in between the lines. Then:
    L11.L22 <0
    >>> L11 becomes: (1+fraction numerator alpha over denominator square root of 2 end fraction)+2(2 plus fraction numerator alpha over denominator square root of 2 end fraction) -1
    >>> L22 becomes : 2 left parenthesis 1 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis plus 4 left parenthesis 2 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis minus 15
    >>> Therefore:
    L11.L22 < 0
    ((1+fraction numerator alpha over denominator square root of 2 end fraction)+2(2 plus fraction numerator alpha over denominator square root of 2 end fraction) -1).(2 left parenthesis 1 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis plus 4 left parenthesis 2 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis minus 15) < 0
    >>> This gives range as fraction numerator negative 4 square root of 2 over denominator 3 end fraction less than alpha less than fraction numerator 5 square root of 2 over denominator 6 end fraction.

    ((1+fraction numerator alpha over denominator square root of 2 end fraction)+2(2 plus fraction numerator alpha over denominator square root of 2 end fraction) -1).(2 left parenthesis 1 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis plus 4 left parenthesis 2 plus fraction numerator alpha over denominator square root of 2 end fraction right parenthesis minus 15) < 0

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