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Question
Solve the following quadratic equation:
`1/(2a + b + 2x) = 1/(2a) + 1/b + 1/(2x)`
Sum
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Solution
`1/(2a + b + 2x) = 1/(2a) + 1/b + 1/(2x)`
⇒ `1/(2a + b + 2x) - 1/(2x) = 1/(2x) + 1/b`
⇒ `(2x - 2a - b - 2x)/(2x(2a + b + 2x)) = 1/(2x) + 1/b`
⇒ `(-(2a + b))/(4x^2 + 4ax + 2bx) = (2a + b)/(2ab)`
⇒ 4x2 + 4ax + 2bx = –2ab
⇒ 4x2 + 4ax + 2bx + 2ab = 0
⇒ 4x(x + a) + 2b(x + a) = 0
⇒ (x + a) (4x + 2b) = 0
⇒ x + a = 0 or 4x + 2b = 0
⇒ `x = -a` or `x = (-b)/2`
Hence, –a and `(-b)/2` are the roots of the given equation.
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Chapter 4: Quadratic Equations - EXERCISE 4A [Page 184]
