factorise x(x+2)(x+4)+4x+8
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x(x+2)(x+4)+4x+8=0
x(x^2+4x+2x+8)+4x+8=0
x^3+6x^2+8x+4x+8=0
x^3+6x^2+12x+8=0
x^2(x+6)+4(3x+2)=0
(x^2+4)(x+6)(3x+2)=0
(x^2+4)=0,(x+6)=0,(3x+2)=0
x=-2,2,-6,-2/3
hopes helps you dear friend
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