Question

Решите неравенство 25х^2>49?

Answer 1

$25 x^{2} \ \textgreater \ 49 \\ \\ x^{2} \ \textgreater \ \frac{49}{25} \\ \\ x^{2} - \frac{49}{25}\ \textgreater \ 0 \\ \\ x^{2} -( \frac{7}{5})^2\ \textgreater \ 0 \\ \\ (x-1.4)(x+1.4)\ \textgreater \ 0 \\ \\ x \in (- \infty ; -1.4) U (1.4; + \infty)$

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