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 2 years ago
Determine the values of a and b for which the following function is continuous at every real number x
f(x) { ax+b if x ≤ 1
2bx^2  8a if 1 < x < 2
4b^2/a 5x if x ≥ 2 }
 2 years ago
Determine the values of a and b for which the following function is continuous at every real number x f(x) { ax+b if x ≤ 1 2bx^2  8a if 1 < x < 2 4b^2/a 5x if x ≥ 2 }

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sriramkumar
 2 years ago
Best ResponseYou've already chosen the best response.0continuous implies \[\lim_{x \rightarrow c}f(x)=f(c)\] for the first one, \[\lim_{x \rightarrow 1}f(x)=f(1)\] \[\lim_{x \rightarrow 1}(ax+b)=a+b\] and so on...

SithsAndGiggles
 2 years ago
Best ResponseYou've already chosen the best response.0\[f(x)=\begin{cases}ax+b&\text{if }x\le1\\ 2bx^28a&\text{if }1<x<2\\ \frac{4b^2}{a5x}&\text{if }x\ge2\end{cases}\] For f(x) to be continuous at x = 1 and x = 2, the following must be satisfied: \[\color{red}{\lim_{x\to1^}f(x)=\lim_{x\to1^+}f(x)}\\ \color{blue}{\lim_{x\to2^}f(x)=\lim_{x\to2^+}f(x)}\] \[RED:\lim_{x\to1^}(ax+b)=\lim_{x\to1^+}(2bx^28a)\\ BLUE: \lim_{x\to2^}(2bx^28a)=\lim_{x\to2^+}\frac{4b^2}{a5x}\] Determining the limits should give you a system of equations (assuming I rewrote the function you provided).
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