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Soloha48 [4]
3 years ago
14

Please solve this

a1" title=" |x ^{2} + 3x - 1 | < 3" alt=" |x ^{2} + 3x - 1 | < 3" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
klasskru [66]3 years ago
8 0
\bf |x^2+3x-1|\ \textless \ 3\implies &#10;\begin{cases}&#10;+(x^2+3x-1)\ \textless \ 3\\\\&#10;-(x^2+3x-1)\ \textless \ 3&#10;\end{cases}\\\\&#10;-------------------------------\\\\&#10;x^2+3x-1\ \textless \ 3\implies x^2+3x-4\ \textless \ 0\implies (x+4)(x-1)\ \textless \ 0&#10;\\\\\\&#10;x\ \textless \ &#10;\begin{cases}&#10;-4\\&#10;1&#10;\end{cases}\\\\&#10;-------------------------------\\\\&#10;-(x^2+3x-1)\ \textless \ 3\implies x^2+3x-1\boxed{\ \textgreater \ }-3&#10;\\\\\\&#10;x^2+3+2\ \textgreater \ 0\implies (x+2)(x+1)\ \textgreater \ 0\implies x\ \textgreater \ &#10;\begin{cases}&#10;-2\\&#10;-1&#10;\end{cases}
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