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mestny [16]
3 years ago
7

If x=√10 - 2 √2 find x^2 + 1/x^2​

Mathematics
1 answer:
Goshia [24]3 years ago
4 0
You already know what x is so just substitute in.
x^2 + 1/x^2
= (√10 - 2√2)^2 + 1/(√10 - 2√2)^2

= (18 - 8√5) + 1/(18 - 8√5)

= (45-12√5)/2
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