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If f(x) = 3x+15x-4 and t = 5+3xx-4, then f(t) is ______ -

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Question

If f(x) = `(3x + 1)/(5x - 4)` and t = `(5 + 3x)/(x - 4)`, then f(t) is ______ 

Options

  • `(11x + 10)/(11x + 41)`

  • `(10x + 11)/(41x + 11)`

  • `(10x + 11)/(11x + 41)`

  • `(11x + 41)/(10x + 11)`

MCQ
Fill in the Blanks

Solution

If f(x) = `(3x + 1)/(5x - 4)` and t = `(5 + 3x)/(x - 4)`, then f(t) is `underline((10x + 11)/(11x + 41))`.

Explanation:

f(x) = `(3x + 1)/(5x - 4)` 

∴ f(t) = `(3t + 1)/(5t - 4) = (3((5 + 3x)/(x - 4)) + 1)/(5((5 + 3x)/(x - 4))- 4) = (10x + 11)/(11x + 41)`

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