Решить неравенство [latex]\sqrt{x+8}\ \textless \ x+2[/latex]
Решить неравенство [latex]\sqrt{x+8}\ \textless \ x+2[/latex]
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[latex]\sqrt{x+8}\ \textless \ x+2[/latex]
[latex] \left \{ {{x+8 \geq 0} \atop {x+2\ \textgreater \ 0}} \atop {( \sqrt{x+8})^2\ \textless \ (x+2)^2 } \right. [/latex]
[latex] \left \{ {{x \geq -8} \atop {x\ \textgreater \ -2}} \atop {x+8\ \textless \ x^2+4x+4 } \right. [/latex]
[latex] \left \{ {{x \geq -8} \atop {x\ \textgreater \ -2}} \atop {-x^2-3x+4\ \textless \ 0 } \right. [/latex]
[latex]\left \{ {{x \geq -8} \atop {x\ \textgreater \ -2}} \atop {x^2+3x-4\ \textgreater \ 0 } \right.[/latex]
[latex]x^2+3x-4=0[/latex]
[latex]D=3^2-4*1*(-4)=25[/latex]
[latex]x_1= \frac{-3+5}{2} =1[/latex]
[latex]x_2= \frac{-3-5}{2} =-4[/latex]
[latex]\left \{ {{x \geq -8} \atop {x\ \textgreater \ -2}} \atop {(x-1)(x+4)\ \textgreater \ 0 } \right. [/latex]
----------[-8]-------------------------------------------
/////////////////////////////////////////////
-----------------------(-2)------------------------------
///////////////////////////////
+ - +
----------------(-4)------------------(1)---------------
////////////////// //////////////////
Ответ: [latex](1;+[/latex] ∞ [latex])[/latex]
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