a) x2-6x+9= x2-2.x.3-32=(x-3)2
b) 4x2-36= 4.(x2-9)= 4.(x2-32)=4.(x+3).(x-3)
c) 8-x3= 23-x3= (2-x).(22+2.x+x2)=(2.x).(4+2x+x2)
\(a,x^2-6x+9\\ =\left(x-3\right)^2\\ b,4x^2-46\\ =\left(2x-6\right)\left(2x+6\right)\\ c,8-x^3\\ \left(2-x\right)\left(4+2x+x^2\right)\)