1) -9(3x-48)(x+1)=0
3х-48=0
3х=48
х=16
х+1=0
х=-1
2) 3(0.5x-4)+8.5x=18
1.5x -12 +8.5x=18
10x=18+12
x= 30:10
х=3
1) -9(3x-48)(x+1)=0
3х-48=0
3х=48
х=16
х+1=0
х=-1
2) 3(0.5x-4)+8.5x=18
1.5x -12 +8.5x=18
10x=18+12
x= 30:10
х=3
27x^2 +459x+432=0
D=210681 - 4*27*432=46656
x1=(459+216) /54= 12,5
x2= (459-216)/54= 4,5
2)8,5x+1,5x-12=18
10x=30
x=3