NCERT Solutions
Class 10 - Mathematics - Chapter 4: QUADRATIC EQUATIONS - Exercise 4.2
Question 3

Question. 3

Find two numbers whose sum is 27 and product is 182.

Answer:

Numbers are 13 and 14.

Detailed Answer with Explanation:

Step 1: Assign variables. Let the two numbers be \(x\) and \(27 - x\), because their sum is given as 27.

Step 2: Use the product condition. Their product is 182, so we form the equation:

\[x(27 - x) = 182\]

Step 3: Expand and simplify.

\[27x - x^2 = 182\]

Rearrange to get the standard quadratic form:

\[-x^2 + 27x - 182 = 0\]

Multiply by \(-1\):

\[x^2 - 27x + 182 = 0\]

Step 4: Factorise the quadratic. We look for two numbers whose product is 182 and whose sum is 27. The pair is 13 and 14 since:

\[13 \times 14 = 182, \quad 13 + 14 = 27\]

So the factorisation is:

\[(x - 13)(x - 14) = 0\]

Step 5: Solve for \(x\).

\[x - 13 = 0 \Rightarrow x = 13\]

\[x - 14 = 0 \Rightarrow x = 14\]

Conclusion: The required numbers are 13 and 14.

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