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Question

The value of $\sqrt{10 + \sqrt{221 + \sqrt{12 + \sqrt{16}}}}$ is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
5

To find the value of the given nested radical expression, we simplify it step-by-step, starting from the innermost part.

Simplifying the Nested Radical Expression

Step 1: Evaluate the Innermost Radical

The innermost part of the expression is $\sqrt{16}$.

Calculation:

$ \sqrt{16} = 4 $

Step 2: Evaluate the Next Nested Radical

Substitute the result from Step 1 into the next radical:

Expression becomes $\sqrt{12 + 4}$.

Calculation:

$ \sqrt{12 + 4} = \sqrt{16} = 4 $

Step 3: Evaluate the Third Nested Radical

Substitute the result from Step 2 into the next radical:

Expression becomes $\sqrt{221 + 4}$.

Calculation:

$ \sqrt{221 + 4} = \sqrt{225} $

We know that $15^2 = 225$, so:

$ \sqrt{225} = 15 $

Step 4: Evaluate the Outermost Radical

Substitute the result from Step 3 into the final radical:

Expression becomes $\sqrt{10 + 15}$.

Calculation:

$ \sqrt{10 + 15} = \sqrt{25} $

We know that $5^2 = 25$, so:

$ \sqrt{25} = 5 $

Final Value

The value of the expression $\sqrt{10 + \sqrt{221 + \sqrt{12 + \sqrt{16}}}}$ is 5.

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Similar Questions

  1. What will the value of the following expression be? 

    $\left(\frac{6+3}{3}\right) - 5 \times (4+5)$

  2. What is the value of the following expression?
    $\frac{\sqrt{225}}{14} \times \frac{\sqrt{196}}{22} \times \frac{\sqrt{484}}{15}$
  3. The value of $\frac{(5.4)^3 - 0.064}{(5.4)^2 + 2.16 + 0.16}$ is:
  4. Solve the following.
    $(1 + \frac{1}{x})(1 + \frac{1}{x+1})(1 + \frac{1}{x+2})(1 + \frac{1}{x+3}) = ?$
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Important Questions from Simplification

  1. What will come in the place of the question mark ‘?’ in the following question?

    (15 + 24) × 3 ÷ 13 + 18 – 5 = ?

  2. What should come in place of the question mark '?' in the following question?

    \n13 × 3 of 5 ÷ 26 = ? + 2.5
  3. What should come in place of the question mark '?' in the following question?

    10% of 450 - (8 × 5) = ? × 5

  4. What will come in the place of the question mark ‘?’ in the following question?

    (66)2 - (34)2 + ?2 = (60)2

  5. What will come in the place of the question mark ‘?’ in the following question?

    3 × ? ÷ 9 = ∛729 × √121
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