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Mathematics

Solve the following equation by factorization:

x+1x1=3x72x5\dfrac{x + 1}{x - 1} = \dfrac{3x - 7}{2x - 5}

Quadratic Equations

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Answer

Given,

x+1x1=3x72x5\Rightarrow \dfrac{x + 1}{x - 1} = \dfrac{3x - 7}{2x - 5}

⇒ (x + 1)(2x - 5) = (3x - 7)(x - 1)

⇒ (2x2 - 5x + 2x - 5) = (3x2 - 3x - 7x + 7)

⇒ (2x2 - 3x - 5) = (3x2 - 10x + 7)

⇒ (3x2 - 10x + 7) - (2x2 - 3x - 5) = 0

⇒ 3x2 - 10x + 7 - 2x2 + 3x + 5 = 0

⇒ x2 - 7x + 12 = 0

⇒ x2 - 3x - 4x + 12 = 0

⇒ x(x - 3) - 4(x - 3) = 0

⇒ (x - 4)(x - 3) = 0

⇒ (x - 4) = 0 or (x - 3) = 0     [Using Zero-product rule]

⇒ x = 4 or x = 3.

Hence, x = {3, 4}.

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