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# Algebra

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If x^2 + 1/x^2 = 171, what is the positive value of x - 1/x?

Apr 13, 2022

#1
+2399
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a = x - 1/x

a^2 = x^2 - 2 + 1/x^2

x^2 + 1/x^2 = 171

a^2 = 171 - 2

a^2 = 169

$$a = \pm 13$$

=^._.^=

Apr 13, 2022

#1
+2399
0

a = x - 1/x

a^2 = x^2 - 2 + 1/x^2

x^2 + 1/x^2 = 171

a^2 = 171 - 2

a^2 = 169

$$a = \pm 13$$

=^._.^=

catmg Apr 13, 2022
#2
+115
0

That is correct  cat Long time u havent been on

Apr 13, 2022
#3
+2399
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Yep, in person school has been quite busy. :((

I wish I could be on more.

=^._.^=

catmg  Apr 13, 2022
#4
+115
0

well glad you are here today

Kakashi  Apr 13, 2022
#5
+2399
0

It's nice to see you too. :))

=^._.^=

catmg  Apr 13, 2022
#6
+115
-1

Thank you

Kakashi  Apr 13, 2022
#7
+2532
+1

If you're comfortable Cat, what grade are you in?

I'm in 7th btw.

BuilderBoi  Apr 13, 2022
edited by BuilderBoi  Apr 13, 2022
#8
+115
-2

You talking to Me?

Kakashi  Apr 13, 2022
#9
+2532
+1

The message wasn't directed to you, it was to catmg.

You already said you were in 7th grade like me :)

BuilderBoi  Apr 13, 2022
#10
+115
-2

oh kk

Kakashi  Apr 13, 2022