Let the set C = (x,y) x² -2y = 2023, x,yin N. Then Σ(x,y)in C(x + y) is equal to

Numerical Answer Type:
Enter a numerical value Answer: 46 to 46 +4 marks

Solution & Explanation

Related Formula

Analyze structural equations through modular constraints (e.g., modulo 3 or 4) to limit potential bounds.

Core Logic

Given the equation: x² - 2^y = 2023. Let us inspect the numbers modulo 8:

2023 ≡ 7 8

A perfect square x² can only be congruent to 0, 1, 4 8.

  • If y ≥ 3, then 2^y ≡ 0 8 x² ≡ 7 8, which is impossible.
  • Therefore, y must be less than 3. Since y in N, the only choices are y = 1 or y = 2.

Step 1: Testing Small Exponent Valuations
  • Case 1: y = 1
x² - 2¹ = 2023 x² = 2025 x = 45 (since 45² = 2025)

This gives a valid natural solution pair: (45, 1).

  • Case 2: y = 2
x² - 2² = 2023 x² = 2027

Since 2027 is not a perfect square, this yields no natural solutions.

Thus, the only valid point element inside set C is (45, 1).

Step 2: Sum Evaluation

Evaluating the required target accumulation:

Σ (x + y) = 45 + 1 = 46
Pattern Recognition

Exponential Diophantine equations (equations with variables in exponents) are best analyzed using modular arithmetic constraints to quickly find small finite upper bounds.

Chapter Mix

Class 11 Mathematics: Principle of Mathematical Induction / Number Theory

Reference Study Guides

More Complex Numbers and Quadratic Equations Previous-Year Questions — Page 9

Q26 jee_main_2024_31_jan_morning Properties of Modulus and Argument
If α denotes the number of solutions of |1 - i|^x = 2^x and β = ((|z|)/( (z))), where z = (π)/(4) (1 + i)⁴ ( 1 - √(π) i√(π) + i + √(π) - i1 + √(π) i), i = √(-1), then the distance of the point (α, β) from the line 4x - 3y = 7 is
Numerical Answer. Answer: 3 to 3

Solution

Core Logic
|1 - i|^x = 2^x (√(2))^x = 2^x 2x/2 = 2^x

This implies (x)/(2) = x x = 0. There is exactly 1 solution, so α = 1.

Step 1: Simplify complex number z
(1+i)⁴ = ((1+i)²)² = (1 + i² + 2i)² = (2i)² = -4

Thus, z = -π ( (1-√(π)i)(√(π)-i)π + 1 + (√(π)-i)(1-√(π)i)1 + π )

Step 2: Simplify Bracket

Let's expand the terms directly: z = (π)/(4)(-4) [ √(π) - π i - i - √(π)π + 1 + √(π) - i - π i - √(π)1 + π ]

= -π [ (-i(π+1))/(π+1) + (-i(π+1))/(π+1) ] = -π [ -i - i ] = 2π i
Step 3: Find beta

For z = 2π i: |z| = 2π and (z) = (π)/(2).

β = (|z|)/( (z)) = (2π)/(π/2) = 4
Step 4: Distance from Line

Distance of point (α, β) = (1, 4) from the line 4x - 3y - 7 = 0:

D = |4(1) - 3(4) - 7|√(4² + (-3)²) = (|4 - 12 - 7|)/(5) = (|-15|)/(5) = 3
Chapter Mix

Class 11 Maths: Complex Numbers and Quadratic Equations Class 11 Maths: Straight Lines

More Complex Numbers and Quadratic Equations Questions — jee_main_2024_29_january_evening

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