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(2^x + 2^-x)^2 = 5^2
2^2x + 2^-2x + 2 = 25
a^2x + 2^-2x = 23
.
2).
= 2√2(√2) + 2√2(√6) - √6(√2) -√6(√6)
= 4 + 2√12 - √12 - 6
= √12 - 2
.
3) (√3+3√2)(√3 +6√2) / (3 -72)
=(3 + 6√6 + 3√6 +18) / (-69)
= (21 + 9√6)/ (-69)
= -7/23 + 3/23√6
= 1/23 ( 7+ 3√6)
.
4)
(√5-√6)²/ (-1) = a+b√30
-11 +2√30 = a +b√30
a.b = -22