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Question Number 124794 by benjo_mathlover last updated on 06/Dec/20

If f(x)= { ((2x ; 0<x<1)),((3 ; x=1 )),((6x−1 ; 1<x<2)) :}  find ∫_0 ^2  f(x) dx ?

$${If}\:{f}\left({x}\right)=\begin{cases}{\mathrm{2}{x}\:;\:\mathrm{0}<{x}<\mathrm{1}}\\{\mathrm{3}\:;\:{x}=\mathrm{1}\:}\\{\mathrm{6}{x}−\mathrm{1}\:;\:\mathrm{1}<{x}<\mathrm{2}}\end{cases} \\ $$ $${find}\:\underset{\mathrm{0}} {\overset{\mathrm{2}} {\int}}\:{f}\left({x}\right)\:{dx}\:? \\ $$

Answered by TITA last updated on 06/Dec/20

∫_0 ^2 f(x)dx=2∫_0 ^1 xdx+3+∫_1 ^2 (6x−1)dx   let ∫_0 ^2 f(x)dx=I  ⇒I= x^2 ∣_0 ^1  +3+(3x^2 −x)_1 ^2   I=4+(10−2)= −4     please check guys

$$\int_{\mathrm{0}} ^{\mathrm{2}} {f}\left({x}\right){dx}=\mathrm{2}\int_{\mathrm{0}} ^{\mathrm{1}} {xdx}+\mathrm{3}+\int_{\mathrm{1}} ^{\mathrm{2}} \left(\mathrm{6}{x}−\mathrm{1}\right){dx}\:\:\:{let}\:\int_{\mathrm{0}} ^{\mathrm{2}} {f}\left({x}\right){dx}={I} \\ $$ $$\Rightarrow{I}=\:{x}^{\mathrm{2}} \mid_{\mathrm{0}} ^{\mathrm{1}} \:+\mathrm{3}+\left(\mathrm{3}{x}^{\mathrm{2}} −{x}\right)_{\mathrm{1}} ^{\mathrm{2}} \\ $$ $${I}=\mathrm{4}+\left(\mathrm{10}−\mathrm{2}\right)=\:−\mathrm{4}\:\:\:\:\:{please}\:{check}\:{guys} \\ $$ $$ \\ $$

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