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If the area of a rectangle be (x^(2) + 7...

If the area of a rectangle be (`x^(2) + 7x + 10)` sq. cm, then one of the possible perimeter of it is

A

`(4x + 14) cm`

B

`(2x + 14) cm`

C

`(x + 14) cm`

D

`(2x + 7) cm`

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The correct Answer is:
To find the perimeter of the rectangle given its area, we can follow these steps: ### Step 1: Understand the Area of a Rectangle The area of a rectangle is given by the formula: \[ \text{Area} = \text{Length} \times \text{Breadth} \] In this case, the area is given as \(x^2 + 7x + 10\) square centimeters. ### Step 2: Factor the Area Expression We need to factor the quadratic expression \(x^2 + 7x + 10\). We look for two numbers that multiply to 10 (the constant term) and add up to 7 (the coefficient of \(x\)). The numbers 5 and 2 satisfy this condition: \[ x^2 + 7x + 10 = (x + 5)(x + 2) \] ### Step 3: Assign Length and Breadth From the factored form, we can assign: - Length = \(x + 5\) - Breadth = \(x + 2\) ### Step 4: Calculate the Perimeter The perimeter \(P\) of a rectangle is given by the formula: \[ P = 2 \times (\text{Length} + \text{Breadth}) \] Substituting the values of length and breadth: \[ P = 2 \times ((x + 5) + (x + 2)) \] Simplifying this: \[ P = 2 \times (2x + 7) \] \[ P = 4x + 14 \] ### Step 5: Conclusion Thus, one possible perimeter of the rectangle is: \[ \boxed{4x + 14} \] ---
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KIRAN PUBLICATION-MENSURATION-Test Yourself
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