Bài 3:
a: \(=x^2\left(x-3\right)-4\left(x-3\right)=\left(x-3\right)\left(x-2\right)\left(x+2\right)\)
b: =(x+y)(2a-1)
c: \(=2\left(x-2\right)+5x\left(x-2\right)=\left(x-2\right)\left(5x+2\right)\)
d: \(=6x\left(x-2\right)-7\left(x-2\right)=\left(x-2\right)\left(6x-7\right)\)