Предмет: Алгебра, автор: karolina6315

x² < 4?

ооочень срочно, помогите пожалуйста​

Ответы

Автор ответа: Universalka
1

\displaystyle\bf\\x^{2} &lt; 4\\\\x^{2} -4 &lt; 0\\\\\Big(x-2\Big)\Big\cdot\Big(x+2\Big) &lt; 0\\\\\\+ + + + + (-2) - - - - - (2) + + + + +

                      /////////////////

\displaystyle\bf\\x\in \Big(-2 \ \ ; \ \ 2\Big)

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