1:(x+1)(x-1)-8 2:-6a+a^2+9 如何进行因式分解?

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1:(x+1)(x-1)-8 2:-6a+a^2+9 如何进行因式分解?

1:(x+1)(x-1)-8 2:-6a+a^2+9 如何进行因式分解?
1:(x+1)(x-1)-8 2:-6a+a^2+9 如何进行因式分解?

1:(x+1)(x-1)-8 2:-6a+a^2+9 如何进行因式分解?
1:(x+1)(x-1)-8
=x²-1-8
=x²-9
=(x-3)(x+3)
2:-6a+a^2+9
=a²-6a+9
=(a-3)²

1:(x+1)(x-1)-8
=x²-9
=(x+3)(x-3)
2:-6a+a^2+9
=a²-6a+9
=(a-3)²

(x+1)(x-1)-8=x^2-9=(x+3)(x-3)
-6a+a^2+9=(a-3)^2

(1)(x+1)(x-1)-8=x^2-1-8=x^2-9=(x+3)(x-3);
(2)-6a+a^2+9=a^2-6a+9=(a-3)^2;
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