solve plz 1wnd 2 question plz urgent
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98 is right answer your questions
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Step-by-step explanation:
1. 3 - 8.6 + 15. 2 + 2.15
= 3-48 + 30 + 30
= 15
2. a= 5+ 2√6
=>a^2 = (5+ 2√6)^2
=> a^2= 25 + 24 + 20√6
=> a^2 = 49+20√6
=> 1/a^2 = 1/(49+20√6) = (49 - 20√6)/(49+20√6)(49 - 20√6)
= (49 - 20√6)/ 49^2 - (20√6)^2
= 49- 20√6/ 2401-2400
= 49-20√6
a^2 + 1/a^2
= 49+20√6 + 49-20√6
= 98
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