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Please tell question 5 First one to answer will be presented as brainliest |
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Answer» √5 ………………………(1)And, 1/X = 1/( 9+4√5)By rationalising the DENOMINATOR= (9–4√5 ) /(81–80)1/x = 9–4√5 ……………………..(2)Hence x + 1/x = 9+ 4√5 + 9 - 4√5 = 18 …………(3)Since x² + (1/x)² = (x + 1/x)² - 2=> x² + (1/x) ² = 18² -2 = 324 -2= 322 ………..(4)Now, x^4 + (1/x)^4= (x² + 1/x² )² -2= (322)² -2= 103684 - 2= 103682 ……….ANSHope this helps! |
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