(19x-10)^2 <=(7x-18)^2
(19x-10)²<=(7x-18)²<br>361x²-380x+100<=49x²-252x+324<br>361x²-49x²-380x+252x+100-324<=0<br>312x²-128x-224<=0 |:6<br>39x²-16x-28<=0<br>D=256+4368=4624 x1=16+68/78=84/78=42/39 x2=16-68/78=-52/78=-26/39=-2/3 xc[-2/3;42/39]
