Y'=(3x^3)+15x^2
(x^a)'=a*x^a-1
120:4+2*3=30+6=36........ 120:(4+2*3)= 120:10=12......... (120:4+2)*3=96........ 120:(4+2)*3=60.
Х2+3=<span>10x-6
х2+3-</span>10x+6=<span>0
х2+</span>9-10x=0
х2-10х+9=0
D=-108-36=-6<span>8
</span>х1=10+8/2
х2=10-8/2
х1=9
х2=1
1/3(х-1)-3/8(х+1)=1
1/3х-1/3-3/8х+1=1
1/3х-3/8х=1+1/3-1
-1/24 х=1
х=1:(-1/24)
х=-24