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I was confused ! This was on my test and it have a 1 minute timer.
KatMBurns
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Jun 21, 2022
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I was confused ! This was on my test and it have a 1 minute timer.
askmath
KatMBurns
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Jun 21, 2022
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KatMBurns
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If (x - 1/x) = 2 then (x - 1/x)^(2) = 4. What happens if you expand (x - 1/x)^(2)?
RosemaryConley
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Jun 21, 2022
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x – 1/x = 2
Since (a–b)² = a² –2ab + b²
(x–1/x)² = 4
x² –2 * x * 1/x + 1/x² = 4
x² –2*x/x + 1/x² = 4
x² –2 + 1/x² = 4
x² + 1/x² = 6
Done!
LucieSoullier
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Jun 21, 2022
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LucieSoullier
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Multiply by x, then solve the quadric to get x. If you got x, plug it in the equation in question and solve.
bobbymagill
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Jun 21, 2022
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I did not know what to do and I couldn't just try the choices because of time.
davidchazan
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Jun 21, 2022
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davidchazan
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10 second method, only works with multiple choice:
x - 1/x = 2 means that x should be somewhere between 2 and 3
Then x² is larger than 4
So x² + 1/x² can only be 6
LowesCareers
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Jun 21, 2022
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LowesCareers
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Unless I’m missing a trick, you’d begin by finding the value of x. Do you know how you’d do that?
BAKEDlive
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Jun 21, 2022
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BAKEDlive
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