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**Principal stresses help plz?**

I am looking through past paper examinations and have come a across a question:

At a certain critical point in a stressed component, calculations show that the stresses are sigma(x) = 220MPa sigma(y) = -95MPa and shear = 60MPa

Find the maximum and minimum direct stresses (principal stresses) in the component at that point?

How do i go about this problem?

Thankyou.