(4+root 15)^x +(4-root 15)^x=8
Lindsay:
I properly didn't understand the question, could you please explain me
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(4+√15)^x +(4-√15)^x
A^x+B^x=(A+B)^x
(4+√15+4-√15)^x
=8^x
A^x+B^x=(A+B)^x
(4+√15+4-√15)^x
=8^x
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