4x2 +24x-36x-216=0
4x2 -12x-216=0
Д= 144-4×4×(-216)= 144+3456=3600=60
х1= 12+60/2×4=72÷8=9
х2= 12-60/2×4=-48÷8=-6
либо
4х-36=0 х+6=0
х=36÷4 х=-6
х=9
4x2 +24x-36x-216=0
4x2 -12x-216=0
Д= 144-4×4×(-216)= 144+3456=3600=60
х1= 12+60/2×4=72÷8=9
х2= 12-60/2×4=-48÷8=-6
либо
4х-36=0 х+6=0
х=36÷4 х=-6
х=9