9. If x² + 4x - 1 = 0 and x is positive then find the value of
(a) x+1/x
(b) x²+1/x²
Answers
Answered by
1
Devide both sides by x
=> x + 4 - 1/x =0
=> x-1/x = -4
=> x^2 + 1/x^2 = 18
=> x+1/x = 2root5
=> x + 4 - 1/x =0
=> x-1/x = -4
=> x^2 + 1/x^2 = 18
=> x+1/x = 2root5
Answered by
0
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(A). x²+1/x = 18
(B). x+1/x = ✓5-2
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