if x=3+root 8,find the value of xsquare +1by xsquare
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x = 3+√8
1/x = 1 / 3+√8 [ you should rationalise it ]
= 1 / 3+√8 x 3-√8 / 3-√8
= 3-√8 / (3)² - (√8)²
= 3-√8 / 9 - 8
1/x = 3-√8
x + 1/x = 3+√8 + 3-√8
x + 1/x = 6
square on the sides
(x + 1/x)² = (6)²
x² + 1/x²+ 2 = 36
x² + 1/x² = 36-2 = 34
x² + 1/x² = 34
plzz mark as brainliest answer
1/x = 1 / 3+√8 [ you should rationalise it ]
= 1 / 3+√8 x 3-√8 / 3-√8
= 3-√8 / (3)² - (√8)²
= 3-√8 / 9 - 8
1/x = 3-√8
x + 1/x = 3+√8 + 3-√8
x + 1/x = 6
square on the sides
(x + 1/x)² = (6)²
x² + 1/x²+ 2 = 36
x² + 1/x² = 36-2 = 34
x² + 1/x² = 34
plzz mark as brainliest answer
djdilip711:
plzz mark as brainliest answer
how to mark i dont know bro
that option is not showing
but anyway thank you so much bro
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Answer:
34
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explanation is in the given pic
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