tomorrow is my test help me plz
answer this question time wasters
solve it plz on copy
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Answer:
b
Step-by-step explanation:
x^2 +1/x^2 =7
(x^2-1/x^2)^2=(x^2+1/x^2)^2-4 x^2"1/x^2
=7^2 -4
=49-4=45
x^2-1/x^2 = sqrt(45)= 3 sqrt(5)
b
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