If x+1/x= 3, find the value of x⁴+1/x⁴
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Answer:
If x+1/x= 3, then value of x⁴+1/x⁴ is 47.
Step-by-step explanation:
Given,
x + 1/x = 3
squaring both sides
(x + 1/x)² = 3²
we know that (a+ b)² = a²+ b²+ 2ab
⇒ x²+(1/x)²+2.x.1/x = 9
⇒ x²+(1/x)²+2 = 9
⇒ x²+(1/x)² = 9-2
⇒ x²+(1/x)²= 7
squaring both sides
(x²+(1/x)² ) ² = 7²
⇒ x⁴ + (1/x)⁴ + 2. x².1/x² = 49
⇒ x⁴ + (1/x)⁴ + 2 = 49
⇒ x⁴ + (1/x)⁴ = 49-2
⇒ x⁴ + (1/x)⁴ = 47
The required answer is 47
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