分解因式(x+1)(x+3)(x+5)(x+7)-9
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(x+1)逗档(扮指带x+3)(x+5)厅芦(x+7)-9
=[(x+1)(x+7)][(x+3)(x+5)]-9
=[x^2+8x+7][(x^2+8x+15]-9
=[x^2+8x]^2+22[x^2+8x]+96
=[x^2+8x+6][x^2+8x+16]
=(x^2+8x+6)(x+4)^2
=[(x+1)(x+7)][(x+3)(x+5)]-9
=[x^2+8x+7][(x^2+8x+15]-9
=[x^2+8x]^2+22[x^2+8x]+96
=[x^2+8x+6][x^2+8x+16]
=(x^2+8x+6)(x+4)^2
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