3 years ago

Factor x^4+6x^2-7 completely.

1 answer:

8 0

Lets change x²=y, so we have equation y²+6y-7=(y-1)(y+7)
make change back so (y-1)(y+7)= (x²-1)(x²+7)=(x²-1²)(x²+7)=(x+1)(x-1)(x²+7)

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