Ridicam la patrat si efectuam inmultirea celor doua paranteze:
[tex]25x^2-10x+1-x^2-8x+6x+48=85[/tex]
24x²-12x-36=0 impart la 12
2x²-x+3=0
[tex]\Delta=b^2-4ac=25[/tex]
[tex]x_{1;2}=\dfrac{-b\pm\sqrt{\Delta}}{2a}=\dfrac{1\pm5}{4}\ si \ de\ aici\ x_1=\dfrac32;\ \ x_2=-1[/tex]