find the zeros of t^2-15 and verify the relationship between the zeroes and ceefficients
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t^2-15=0
t^2=15
t=+_(15)^1/2
t=+15^1/2;t=-15^1/2
t^2=15
t=+_(15)^1/2
t=+15^1/2;t=-15^1/2
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