Math  /  Algebra

Question10.1 Given f(x)=3x2f(x)=3-x^{2} (with domain (,))\left.(-\infty, \infty)\right), g(x)=2x(g(x)=2-x( with domain (,))(-\infty, \infty)), h(x)=1xh(x)=\frac{1}{x} (with domain (0,))\left.(0, \infty)\right), find the following compositions (a) fgf \circ g (b) gfg \circ f (c) fhf \circ h (d) ghg \circ h (+) hof; What is the domain this function? (+)(+) hog; What is the domain this function? 10.2 Determine the inverses of the following functions (a) f(x)=45xf(x)=4-5 x, (with domain (,)(-\infty, \infty) ) (b) h(x)=x23x+2h(x)=x^{2}-3 x+2, (with domain (2,))]\left.\left.(2, \infty)\right)\right] (+)f(x)=2x+13x(+) f(x)=\frac{2 x+1}{3-x}, (also find the domain and range of \ell and of f1f^{-1} )

Studdy Solution
Find the inverse of f(x)=2x+13x f(x) = \frac{2x+1}{3-x} .
Set y=2x+13x y = \frac{2x+1}{3-x} and solve for x x :
y(3x)=2x+1 y(3-x) = 2x + 1 3yyx=2x+1 3y - yx = 2x + 1 3y1=2x+yx 3y - 1 = 2x + yx 3y1=x(2+y) 3y - 1 = x(2 + y) x=3y12+y x = \frac{3y - 1}{2 + y}
Thus, the inverse is f1(x)=3x12+x f^{-1}(x) = \frac{3x - 1}{2 + x} .
The domain of f f is x3 x \neq 3 , or (,3)(3,) (-\infty, 3) \cup (3, \infty) .
The range of f f is all real numbers except the value that makes the denominator zero in the inverse, which is y2 y \neq -2 .
The domain of f1 f^{-1} is x2 x \neq -2 , or (,2)(2,) (-\infty, -2) \cup (-2, \infty) .

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