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Question

Find the least positive integer such that its square is greater than 5 times of the integer by $-6$.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
2

Integer Square Condition Setup

Let the positive integer be represented by '$n$'. The problem states that the square of the integer ('$n^2$') is greater than 5 times the integer ('$5n$') by $-6$. This translates to the equation:

$n^2 = 5n + (-6)$

$n^2 = 5n - 6$

Solving the Quadratic Equation

To find the integer '$n$', we rearrange the equation into the standard quadratic form ($ax^2 + bx + c = 0$):

$n^2 - 5n + 6 = 0$

Now, we factor the quadratic expression:

$ (n - 2)(n - 3) = 0 $

This equation yields two possible integer solutions:

  • $n - 2 = 0 \implies n = 2$
  • $n - 3 = 0 \implies n = 3$

Identifying the Least Positive Integer

The possible integer values for '$n$' are 2 and 3. Both are positive integers.

The question asks for the least positive integer that satisfies the condition.

Comparing the solutions {2, 3}, the least value is 2.

Final Answer

The least positive integer satisfying the condition is 2.

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Similar Questions

  1. The roots of the equation $3x^{2} + 5x - a = 0$ are the reciprocals of each other. What is the value of $a$?
  2. If the roots of the equation $(4 + m)x^2 + (m + 1)x + 1 = 0$ are equal, then find the values of m.
  3. The roots of the equation $y^2 - \sqrt{5} y - y + \sqrt{5} = 0$ are:
  4. The equation whose roots are $-2$ and $3$ is:
  5. If one of the roots of the equation $x^2 - 19x + 88 = 0$ is 8, then what is the other root?
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  7. The positive value of m for which the roots of the equation ${12}{x}^2 + mx + 6 = 0$ are in the ratio of 2 : 3 is ______.

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Important Questions from Quadratic Equation

  1. If 2x 2+ 5x + 1 = 0, then one of the values of \(x - \frac{1}{{2x}}\)  is:

  2. If \(a-\frac{12}{a}=1\) , where a > 0, then the value of \(a^2+\frac{16}{a^2}\) is:

  3. If x 2 – 3x + 1 = 0, then the value of  \(\frac{(x^4+\frac{1}{x^2})}{(x^2+5x+1)}\)  is:

  4. If \(\sqrt{x}{}-{1\over\sqrt{x}}=\sqrt5\) \(x \ne 0\) , then what is the value of  \((x^4+{1\over{x^2}})\over(x^2+1) \)  ?

  5. If x 2\(\frac{1}{x^2}\)  = 18, x > 0, then find the value of x \(\frac{1}{x^3}\) .

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