If x = 1/x-5
x ≠ 5, find : x²-1/x²
Answers
Answer:
Here you go mate
Step-by-step explanation:
x = 1 / ( x - 5 )
x -5 = 1 / x [since x is not equal to zero]
Let x - 1 / x = 5 be (1)
Squaring both sides
( x - 1 / x ) ^ 2 = 25
[ x^2 – 2x( 1/x ) + 1 ] / (x^2) = 25
x^2 – 2 + 1 / (x^2) = 25
x^2 + 1 / (x^2) = 25 + 2 = 27
Adding 2 to both sides we have
x^2 + 2 + 1 / (x^2) = 29
x^2 + 2x( 1/x ) + 1/( x^2 ) = 29
( x + 1 / x )^2 = 29
Let x + 1 / x = (29) ^ ( 1/2 ) be (2)
Multiplying (1) and (2) we have
x^2–1/x^2=+-5×(29)^(1/2)
Hope it helps.