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Question Number 99340 by bobhans last updated on 20/Jun/20

Given a function f(x)= { ((2x−a , x<−3)),((ax+b , −3≤x≤3)),((b−5x , x>3)) :}  find the value of a and b such that   lim_(x→−3) f(x) and lim_(x→3)  f(x) exist

$$\mathrm{Given}\:\mathrm{a}\:\mathrm{function}\:\mathrm{f}\left(\mathrm{x}\right)=\begin{cases}{\mathrm{2x}−\mathrm{a}\:,\:\mathrm{x}<−\mathrm{3}}\\{\mathrm{ax}+\mathrm{b}\:,\:−\mathrm{3}\leqslant\mathrm{x}\leqslant\mathrm{3}}\\{\mathrm{b}−\mathrm{5x}\:,\:\mathrm{x}>\mathrm{3}}\end{cases} \\ $$ $$\mathrm{find}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:\mathrm{a}\:\mathrm{and}\:\mathrm{b}\:\mathrm{such}\:\mathrm{that}\: \\ $$ $$\underset{{x}\rightarrow−\mathrm{3}} {\mathrm{lim}f}\left(\mathrm{x}\right)\:\mathrm{and}\:\underset{{x}\rightarrow\mathrm{3}} {\mathrm{lim}}\:\mathrm{f}\left(\mathrm{x}\right)\:\mathrm{exist}\: \\ $$

Commented byPRITHWISH SEN 2 last updated on 20/Jun/20

3a+b=b−15⇒a=−5  −6+5=15+b⇒b=−16   please check

$$\mathrm{3a}+\mathrm{b}=\mathrm{b}−\mathrm{15}\Rightarrow\mathrm{a}=−\mathrm{5} \\ $$ $$−\mathrm{6}+\mathrm{5}=\mathrm{15}+\mathrm{b}\Rightarrow\mathrm{b}=−\mathrm{16}\:\:\:\boldsymbol{\mathrm{please}}\:\boldsymbol{\mathrm{check}} \\ $$

Commented bybobhans last updated on 20/Jun/20

thank you

$$\mathrm{thank}\:\mathrm{you} \\ $$

Commented byPRITHWISH SEN 2 last updated on 20/Jun/20

welcome

$$\mathrm{welcome} \\ $$

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