a)\(4abc-8ab^2c=4abc\left(1-2b\right)\)
b)\(x^2\left(2a-1\right)+x\left(1-2a\right)\)
=\(x\left[x\left(2a-1\right)+1-2a\right]\)
c)\(9a^4\left(a-2\right)+a^2\left(a-2\right)\)
=\(a^2\left(a-2\right)\left(9a^2+1\right)\)
d)\(\left(a-4\right)\left(2a-1\right)-8a+4\)
= \(\left(a-4\right)\left(2a-1\right)-4\left(2a-1\right)\)
=\(\left(2a-1\right)\left(a-4-4\right)\)
=\(\left(2a-1\right).a\)
a) \(4abc-8ab^2c=4abc\left(1-2b\right)\)
b) \(x^2\left(2a-1\right)+x\left(1-2a\right)=\left(2a-1\right)\left(x^2-x\right)=x\left(x-1\right)\left(2a-1\right)\)
c) \(9a^4\left(a-2\right)+a^2\left(a-2\right)=a^2\left(a-2\right)\left(9a^2+1\right)\)
d) \(\left(a-4\right)\left(2a-1\right)-8a+4=\left(a-4\right)\left(2a-1\right)-4\left(2a-1\right)=\left(2a-1\right)\left(a-8\right)\)
