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प्रश्न
Solve the following quadratic equation:
`(x/(x + 1))^2 - 5(x/(x + 1)) + 6 = 0, x ≠ b, a`
योग
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उत्तर
`(x/(x + 1))^2 - 5(x/(x + 1)) + 6 = 0`
Putting `x/(x + 1) = y`, we get:
⇒ y2 – 5y + 6 = 0
⇒ y2 – 5y + 6 = 0
⇒ y2 – (3 + 2)y + 6 = 0
⇒ y2 – 3y – 2y + 6 = 0
⇒ y(y – 3) – 2(y – 3) = 0
⇒ (y – 3)(y – 2) = 0
⇒ y – 3 = 0 or y – 2 = 0
⇒ y = 3 or y = 2
Case I:
If y = 3, we get
⇒ `x/(x + 1) = 3`
⇒ x = 3(x + 1) ...(On cross multiplying)
⇒ x = 3x + 3
⇒ `x = (-3)/2`
Case II:
If y = 2, we get:
⇒ `x/(x + 1) = 2`
⇒ x = 2(x + 1)
⇒ x = 2x + 2
⇒ –x = 2
⇒ x = –2
Hence, the roots of the equation are `(-3)/2` and –2.
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