x^2-nx+48=0 x1=3x2 найти n

x1*x2=48x1=3x23x2*x2=48x2²=48:3=16x2=±4x2=4x1=3*4=12n=x1+x2=12+4=16x2=-4x1=3*(-4)=-12n=x1+x2=-12-4=-16