Х2-5х+k=0;х=-3
(-3)^2-5(-3)+k=0
9+15+k=0
K=-24
X2-5x-24=0;D=b^2-4ac=25+96=121
X2=(5+11)/2=8
ответ:к=-24,х2=8
3х2+8х+k=0;x=-3
3(-3)^2+8(-3)+k=0
27-24+k=0
K=-3
3x2+8x-3=0
D=64+36=100
X2=(-8+10)/6=2/6=1/3
ответ:k=-3,x2=1/3
X2+kx+18=0;x=-3
(-3)^2+k(-3)+18=0
9-3k+18=0
-3k+27=0
-3k=-27
K=9
X2+9x+18=0; x=-3
D=81-72=9
X2=(-9-3)/2=-12/2=-6
ответ: k=9, x2=-6
5x2+kx-12=0;x=-3
5(-3)^2+k(-3)-12=0;x=-3
45-3k-12=0
-3k+33=0
-3k=-33
K=11
5x2+11x-12=0;x=-3
D=121+240=361
X2=(-11+19)/10=8/10=4/5
ответ:k=11 x2=4/5
Х2-5х+k=0;х=-3
(-3)^2-5(-3)+k=0
9+15+k=0
K=-24
X2-5x-24=0;D=b^2-4ac=25+96=121
X2=(5+11)/2=8
ответ:к=-24,х2=8
3х2+8х+k=0;x=-3
3(-3)^2+8(-3)+k=0
27-24+k=0
K=-3
3x2+8x-3=0
D=64+36=100
X2=(-8+10)/6=2/6=1/3
ответ:k=-3,x2=1/3
X2+kx+18=0;x=-3
(-3)^2+k(-3)+18=0
9-3k+18=0
-3k+27=0
-3k=-27
K=9
X2+9x+18=0; x=-3
D=81-72=9
X2=(-9-3)/2=-12/2=-6
ответ: k=9, x2=-6
5x2+kx-12=0;x=-3
5(-3)^2+k(-3)-12=0;x=-3
45-3k-12=0
-3k+33=0
-3k=-33
K=11
5x2+11x-12=0;x=-3
D=121+240=361
X2=(-11+19)/10=8/10=4/5
ответ:k=11 x2=4/5