If x + 1/x = 9 , find the value of x² + 1/x²
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Answered by
0
Step-by-step explanation:
x+1/x=9
squaring on both sides
(x+1/x)²=81
x²+1/x²+2(x)(1/x)=81
x²+1/x²=81-2
x²+1/x²=79
Answered by
1
Answer:
Given ( x – 1 ) = 9
x
squaring the both sides
= ( x – 1 )² = 9²
x
= x² + 1 – 2 × x × 1 = 81
x² x
= x² + 1 – 2 = 81
x²
= x² + 1 = 81 + 2 = 83
x²
= ( x² + 1 ) = 83
x²
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