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Sagot :
The first step we need to take is find the expression of g(x) divided by f(x):
[tex]h(x)=\frac{x^2-9}{2-x^{\frac{1}{2}}}[/tex]We can rewrite the fractional power as a square root.
[tex]h(x)=\frac{x^2-9}{2-\sqrt[]{x}}[/tex]There are two possible restrictions on this domain. The first one exists because of the square root, a square root doesn't have real results for negative values, so x can't be negative. There is a second restriction, since we have a polynomial on the denominator, we need to make sure that the values for x don't make the polynomial equal to 0, because we can't divide by 0. To find these values we must equate the expression with 0 and solve for x.
[tex]\begin{gathered} 2-\sqrt[]{x}=0 \\ \sqrt[]{x}=2 \\ (\sqrt[]{x})^2=2^2 \\ x=4 \end{gathered}[/tex]Therefore "x" can't be 4, nor negative. So the domain is:
[tex]\mleft\lbrace x\in\mathfrak{\Re }\colon0\le x<4\text{ or }x>4\mright\rbrace[/tex]
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