(x^ - 4x+3)(x^+12x+35)+15 .指数为二.^是指数.

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(x^ - 4x+3)(x^+12x+35)+15 .指数为二.^是指数.

(x^ - 4x+3)(x^+12x+35)+15 .指数为二.^是指数.
(x^ - 4x+3)(x^+12x+35)+15 .
指数为二.^是指数.

(x^ - 4x+3)(x^+12x+35)+15 .指数为二.^是指数.
(x^ - 4x+3)(x^+12x+35)+15
=(x-1)(x-3)(x+5)(x+7)+15
=(x^2+4x-5)(x^2+4x-21)+15
=(x^2+4x-5)^2-16(x^2+4x-5)+15
=(x^2+4x-20)(x^2+4x-6)

因式分解吧?
原式=(x-1)(x-3)(x+5(x+7)+15
=[(x-1)(x+5)][(x-3)(x+7)]+15
=(x^2+4x-5)(x^2+4x-21)+15
令x^2+4x=A
原式=(A-5)(A-21)+15
=A^2-26A+120
=(A-20)(A-6)
=(x^2+4x-20)(x^2+4x-6)

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