Mathematics
The diagonal of a rectangular field is 16 m more than the shorter side. If the longer side is 14 m more than the shorter side, find the length and the breadth of the rectangular field.
Quadratic Equations
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Answer
Let the shorter side of the rectangular field be x m.
It is given that the diagonal of a rectangular field is 16 m more than the shorter side.
⇒ d = x + 16
And, the longer side is 14 m more than the shorter side.
⇒ l = x + 14
As we know that angles of rectangle are 90°. Using Pythagoras theorem,
⇒ diagonal2 = length2 + breadth2
⇒ (x + 16)2 = (x + 14)2 + x2
⇒ x2 + 162 + 32x = x2 + 142 + 28x + x2
⇒ x2 + 256 + 32x = 2x2 + 196 + 28x
⇒ 2x2 + 196 + 28x - x2 - 256 - 32x = 0
⇒ x2 - 4x - 60 = 0
⇒ x2 - 10x + 6x - 60 = 0
⇒ x(x - 10) + 6(x - 10) = 0
⇒ (x - 10)(x + 6) = 0
⇒ (x - 10) = 0 or (x + 6) = 0
⇒ x = 10 or x = -6
As length of shorter side cannot be negative,
Length = 10 + 14 = 24 m
Hence, length and breath of the rectangle = 24 m and 10 m.
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