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gogolik [260]
2 years ago
13

Which of the following tangent points on g(x)=36/(x - 1) has an instantaneous rate of change of -9?

Mathematics
2 answers:
mr_godi [17]2 years ago
6 0
The statement correct is: a(-3,-9).
Veronika [31]2 years ago
6 0
\bf g(x)=\cfrac{36}{x-1}\implies g(x)=36(x-1)^{-1}\qquad thus
\\\\\\
\cfrac{dg}{dx}=36\cdot -1(x-1)^{-2}\implies \cfrac{dg}{dx}=-\cfrac{36}{(x-1)^2}\\\\
-------------------------------\\\\
\textit{now, if the instantaneous rate of change is -9, then}
\\\\\\
-9-\cfrac{36}{(x-1)^2}\implies (x-1)^2=\cfrac{-36}{-9}\implies (x-1)^2=4
\\\\\\
x-1=\pm\sqrt{4}\implies x-1=\pm 2\quad x=
\begin{cases}
3\\
-1
\end{cases}

well, then we know when x = 3 or -1, the slope is -9, what's "y"?

\bf x=3\qquad  g(x)=\cfrac{36}{(3)-1}\implies g(x)=18\qquad \boxed{(3,18)}
\\\\\\
x=-1\qquad g(x)=\cfrac{36}{(-1)-1}\implies g(x)=-18\qquad (3,-18)
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