Algebra and Applications Test 1

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Question : 28 of 40

Marks: +1, -0

If

x+1/x=6

, then

x^4+1/x^4

is:

1,152
1,154
1,148
1,150

Solution:

x+1/x=6

Squaring both sides we get

x^2+1/x^2+2=36

x^2+1/x^2 =34

Squaring again both sides we get

x^4+1/x^4+2=1156

x^4+1/x^4 =1154

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