Number of integral values of a for which 1ye1xx2axx2 y22 is true x R and y 0 (where [.]denotes G.I.F), is
Question
Number of integral values of a for which 1ye1xx2axx2 y22 is true x R and y 0 (where [.]denotes G.I.F), is
Solution
To find the number of integral values of "a" for which the given equation is true for all real values of "x" and non-negative values of "y", we can follow these steps:
Step 1: Rewrite the equation using the greatest integer function (G.I.F) notation: [1 + y] = [e^(1 + x^2 + ax^2 + y^2)]
Step 2: Since the G.I.F function only takes integer values, we can rewrite the equation as: 1 + y = e^(1 + x^2 + ax^2 + y^2) - 1
Step 3: Simplify the equation: y = e^(1 + x^2 + ax^2 + y^2) - 2
Step 4: Notice that the right side of the equation is always positive, so "y" must also be positive or zero. Therefore, we can rewrite the equation as: y = e^(1 + x^2 + ax^2 + y^2) - 2 ≥ 0
Step 5: To find the integral values of "a" that satisfy the equation, we need to analyze the behavior of the exponential function. Since "e^x" is always positive, the right side of the equation will always be positive. Therefore, the left side (y) must also be positive or zero.
Step 6: For "y" to be positive or zero, the exponential function must be greater than or equal to 2. So we can write the inequality: e^(1 + x^2 + ax^2 + y^2) ≥ 2
Step 7: Taking the natural logarithm of both sides of the inequality, we get: 1 + x^2 + ax^2 + y^2 ≥ ln(2)
Step 8: Since "x" can take any real value, we can ignore the terms involving "x" in the inequality. So we are left with: 1 + y^2 ≥ ln(2)
Step 9: Solving the inequality, we find that "y" must satisfy: y^2 ≥ ln(2) - 1
Step 10: Since "y" must be non-negative, we can rewrite the inequality as: y^2 ≥ max(0, ln(2) - 1)
Step 11: The maximum value of the right side occurs when ln(2) - 1 is positive, so we can rewrite the inequality as: y^2 ≥ ln(2) - 1
Step 12: Taking the square root of both sides, we get: y ≥ √(ln(2) - 1)
Step 13: Since "y" must be an integer, we can find the smallest integer value that satisfies the inequality: y ≥ ceil(√(ln(2) - 1))
Step 14: Finally, we can count the number of integral values of "a" by considering the range of "y" values that satisfy the inequality. For each valid "y" value, there will be a corresponding "a" value that satisfies the equation. Therefore, the number of integral values of "a" is equal to the number of integral values of "y" that satisfy the inequality.
Note: The exact value of "y" and the resulting number of integral values of "a" will depend on the specific value of ln(2) - 1.
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