x^4-5x^2+4 how do you simplify this
x^4-5x^2+4
$$x^4-5x^2+4=(x^2-1)\cdot (x^2 -4 )=(x-1)\cdot (x+1) \cdot (x-2 ) \cdot (x+2)$$
sorry i am greek i didn't mean simplify i meant to do this like this (dont know how its called in english)
p.e. 2x-2= 2(x-1)
thx