If x = 9 - 4✓5 , find x^2-1/x^2
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Answer:
-6.09
Step-by-step explanation:
x = 9 - 4✓5
x^2-1/x^2 = (9 - 4✓5)^2 - 1/(9 - 4✓5)^2
x^2-1/x^2 = (9 - 4x2.24)^2 - 1/(9 - 4x2.24)^2 value of ✓5 = 2.24
x^2-1/x^2 = (9 - 8.96)^2 - 1/(9 - 8.96)^2
x^2-1/x^2 = (0.4)^2 - 1/(0.4)^2
x^2-1/x^2 = 0.16 - 1/0.16
x^2-1/x^2 = -6.09
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