The state of stress at a point on a body is given by the following stress components: ( σₓ = 11; σy = -14; τₓy = -21; ) Determine the principal stresses.
a) ( σ₁ = 7.43, σ₂ = -20.43 )
b) ( σ₁ = 20.43, σ₂ = -7.43 )
c) ( σ₁ = 25.43, σ₂ = -2.43 )
d) ( σ₁ = -25.43, σ₂ = 2.43