a=6-√35 find the value of a2+1/a2 how last two steps r done I can't understand
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a² = (6 - √35)² = 36 - 12√35 + 35 = 71 - 12√35
1/a² = 71 + 12√35 = 71 + 12√35 = 71 + 12√35
(71)² - (12√35)² 5041 - 5040
a² + 1/a² = 71 - 12√35 + 71 + 12√35 = 142
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