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Question

Solve: 22x-1x+3-3x+32x-1=5, x-3,12.

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Solution

2(2x 1x + 3) 3(x + 32x 1) = 54x 2x + 3 3x + 92x 1 = 5(4x 2)(2x 1) (x + 3)(3x + 9)(x + 3)(2x 1) = 5⇒ 8x2 4x 4x + 2 (3x2 + 9x + 9x + 27) = 5(2x2 x + 6x 3)⇒ 8x2 8x + 2 3x2 9x 9x 27 = 10x2 5x + 30x 15⇒ 10x2 5x2 + 25x + 26x 15 + 25 = 0⇒ 5x2 + 51x + 10 = 0 5x2 + 50x + x + 10 = 0 5x(x + 10) + 1(x + 10) = 0 (x + 10)(5x + 1) = 0 x = 10, x = 15

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