Question

1) se 2ˣ+2⁻ˣ = K, calcule 8ˣ + 8⁻ˣ ?

Answer 1

Olá Camislaa

2^x + 2^-x = k

(2^x + 2^-x)³ = 8^x + 8^-x + 3*(2^x + 2^-x) = k³

8^x + 8^-x = k³ - 3k 

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