The length of the garden is 5 m longer than its width and the area is 14 m2. How long is the garden? - Sri Chaitanya Infinity Learn Best Online Courses for NCERT Solutions, CBSE, ICSE, JEE, NEET, Olympiad and Class 6 to 12

A
$l = 7, b = 2$
B
$l = 14, b = 9$
C
$l = 9, b = 4$
D
$l = 6, b = 1$

Solution:

Let the width of the garden

(b)

' x' m

.
Therefore, length of the garden

(l)

will be

(x + 5) m

.
Now, as the length and the width of the garden are not equal, therefore, the garden is in a rectangular shape as shown in the figure alongside.
Therefore, as the area of the garden is given to us, therefore, we will be using the formula of the area of the rectangle to find the length and the width of the garden.
We know, Area of the rectangular garden

= l \times b

Given: Area of the garden

= 14 m^{2}

.
Now, put the values,

\Rightarrow Area = l \times b

\Rightarrow 14 = (x + 5) \times x

\Rightarrow 14 = x^{2} + 5 x

\Rightarrow x^{2} + 5 x - 14 = 0

\Rightarrow x^{2} + (7 - 2) x - 14 = 0

\Rightarrow x^{2} + 7 x - 2 x - 14 = 0

\Rightarrow x (x + 7) - 2 (x + 7) = 0

\Rightarrow (x + 7) (x - 2) = 0

Either,

\Rightarrow x + 7 = 0

\Rightarrow x = - 7

Or,

\Rightarrow x - 2 = 0

\Rightarrow x = 2

As we know that the length and width of the garden cannot be negative, therefore,

\Rightarrow x \neq - 7

Hence,

x = 2

.
Therefore,

\Rightarrow

Width of the garden

= x m = 2 m

\Rightarrow

Length of the garden

(x + 5) m = (2 + 5) m = 7 m

The length of the garden is $5 m$ longer than its width and the area is $14 m^{2}$ . How long is the garden?

Solution:

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