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salantis [7]
3 years ago
10

Let p=x^2+6

Mathematics
1 answer:
stepan [7]3 years ago
8 0
That's a bit of a nasty. Where ever you see (x^2 + 6) you put in p.
p^2  - 21 = 4(x^2 + 6)
p^2 - 21 = 4p
p^2 - 4p - 21 = 0

A <<<< answer. 

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