x1-2=7/5 x1=2+1,4=3,4
k/5=3,4*(-2)=-6,8
k=-6,8*5=-34
5x^2-7x+k=0
x^2-7/5x+k/5=0
По теореме Виета:
x1+x2=7/5
x1x2=k/5
-2+x2=7/5
x2=17/5
-2*3,4=k/5
-6,8*5=k
k=-34
