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1-1-x-3-1-x-4-If-x-gt-0-and-x-3-which-of-the-following-is-equivalent-to-the-expresion-above-A-2x-1-B-x-2-x-12-C-x-2-x-12-2x-1-




Question Number 127933 by AgnibhoMukhopadhyay last updated on 03/Jan/21
                    (1/((1/(x − 3)) + (1/(x + 4))))    If x > 0 and x ≠ 3, which of the     following is equivalent to the   expresion above?  A.  2x + 1  B.  x^2  + x − 12   C.  ((x^2  + x − 12)/(2x + 1))  D.  ((2x + 1)/(x^2  + x −12))
$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{1}}{\frac{\mathrm{1}}{{x}\:−\:\mathrm{3}}\:+\:\frac{\mathrm{1}}{{x}\:+\:\mathrm{4}}} \\ $$$$ \\ $$$$\mathrm{If}\:{x}\:>\:\mathrm{0}\:\mathrm{and}\:{x}\:\neq\:\mathrm{3},\:\mathrm{which}\:\mathrm{of}\:\mathrm{the}\:\:\: \\ $$$$\mathrm{following}\:\mathrm{is}\:\mathrm{equivalent}\:\mathrm{to}\:\mathrm{the}\: \\ $$$$\mathrm{expresion}\:\mathrm{above}? \\ $$$$\mathrm{A}.\:\:\mathrm{2}{x}\:+\:\mathrm{1} \\ $$$$\mathrm{B}.\:\:{x}^{\mathrm{2}} \:+\:{x}\:−\:\mathrm{12}\: \\ $$$$\mathrm{C}.\:\:\frac{{x}^{\mathrm{2}} \:+\:{x}\:−\:\mathrm{12}}{\mathrm{2}{x}\:+\:\mathrm{1}} \\ $$$$\mathrm{D}.\:\:\frac{\mathrm{2}{x}\:+\:\mathrm{1}}{{x}^{\mathrm{2}} \:+\:{x}\:−\mathrm{12}} \\ $$
Answered by bramlexs22 last updated on 03/Jan/21
(1/((2x+1)/(x^2 +x−12))) = ((x^2 +x−12)/(2x+1))
$$\frac{\mathrm{1}}{\frac{\mathrm{2x}+\mathrm{1}}{\mathrm{x}^{\mathrm{2}} +\mathrm{x}−\mathrm{12}}}\:=\:\frac{\mathrm{x}^{\mathrm{2}} +\mathrm{x}−\mathrm{12}}{\mathrm{2x}+\mathrm{1}}\: \\ $$

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