(three - two *sqrt(two))^x+(three + two *sqrt(two))^x= six
(3 minus 2 multiply by square root of (2)) to the power of x plus (3 plus 2 multiply by square root of (2)) to the power of x equally 6
(three minus two multiply by square root of (two)) to the power of x plus (three plus two multiply by square root of (two)) to the power of x equally six