(x+2)(x+4)+x²-4
=x²+6x+8+x²-4
=2x²+6x+4
=2(x²+3x+2)
=2(x+1)(x+2)
(x+2)(x+4)+x²-4
=(x+2)(x+4)+(x_2)(x+2)
=(x+2)(x+4+x-2)
=(x+2)(2x+2)
=2(x+2)(x+1)
(x+2)(x+4)+x²-4
=(x+2)(x+4)+(x+2)(x-2)
=(x+2)[(x+4)+(x-2)]
=(x+2)(2x+2)
=2(x+2)(x+1)
(x+2)(x+4)+x²-4
=(x+2)(x+4)+(x+2)(x-2)
=(x+2)(x+4+x-2)
=(x+2)(2x+2)
=2(x+2)(x+1)