(х - 4 )² = 4х - 11

x2-8x+16=4x-11

x2-12x+27=0

D=b2-4ac   = 144-4*1*27=36

x= (-b+- кв.кор из D)/2a

x1 = (12+6)/2=9

x2 = (12-6)/2=3

(x-4)^2=4x-11

x^2-8x+16=4x-11

x^2-8x-4x+11+16=0

x^2-12x+27=0

d=144-4*1*27=36

x1=12-6/2=3

x2=12+6/2=9