0 \\ \\ x_1= \frac{-b- \sqrt{D} }{2a}= \frac{25- \sqrt{225} }{2*4}=1,25 \\ \\ x_2 =\frac{-b+ \sqrt{D} }{2a}= \frac{25+\sqrt{225} }{2*4}=5" alt="(5-x)^2=3x(5-x) \\ \\ 25-10x+x^2=15x-3x^2 \\ \\ 4x^2-25x+25=0 \\ \\ D=b^2-4ac=25^2-4*4*25=225>0 \\ \\ x_1= \frac{-b- \sqrt{D} }{2a}= \frac{25- \sqrt{225} }{2*4}=1,25 \\ \\ x_2 =\frac{-b+ \sqrt{D} }{2a}= \frac{25+\sqrt{225} }{2*4}=5" align="absmiddle" class="latex-formula">