0\\2t^2-7t-9=0\\D=49+72=121=11^2\\t_{1,2}=\frac{7\pm 11}{4}=\left |{ {{-1} \atop {4,5}} \right. \\t=4,5\\|x|=4,5\\\left [{ {{x=4,5} \atop {x=-4,5}} \right." alt="\displaystyle \sf 2x^2-7|x|-9=0\\|x|=t, t>0\\2t^2-7t-9=0\\D=49+72=121=11^2\\t_{1,2}=\frac{7\pm 11}{4}=\left |{ {{-1} \atop {4,5}} \right. \\t=4,5\\|x|=4,5\\\left [{ {{x=4,5} \atop {x=-4,5}} \right." align="absmiddle" class="latex-formula">
Ответ: ![-4,5;4,5 -4,5;4,5](https://tex.z-dn.net/?f=-4%2C5%3B4%2C5)