-0,5\\\\x_2= \frac{-11-13}{2*4}= \frac{-24}{8}=-3<-0,5\\\\x=-0,25 " alt=" \sqrt{4-7x}=2x+1\\2x+1 \geq 0\\2x \geq -1\\x \geq -0,5\\\\ (\sqrt{4-7x})^2=(2x+1)^2\\4-7x=4x^2+4x+1\\4x^2+4x+7x+1-4=0\\4x^2+11x-3=0\\D=11^2-4*4*(-3)=121+48=169=13^2\\\\x_1= \frac{-11+13}{2*4}= \frac{-2}{8}=-0,25>-0,5\\\\x_2= \frac{-11-13}{2*4}= \frac{-24}{8}=-3<-0,5\\\\x=-0,25 " align="absmiddle" class="latex-formula">