Y`=3x²+22x-45=0
D=484+540=1024
x1=(-22-32)/6=-9∈[-14;-8]
x2=(-22+32)/6=5/3∉[-14;-8]
y(-14)=-2744+2156+720-20=112
y(-9)=-729+891+405-20=547 наиб
y(-8)=-512+704+360-20=532
(4k-3)/4-(3-2k)/2<=0
4k-3-6+4k<=0
8k-9<=0
k<=9/8
k<=1,125
5-21+12х=14х-29
14х-12х=-16+29
2х=13
х=6,5