Let M = [[-1,1],[5,2]]. Find c₁ and c₂ such that M² + c₁M + c₂I₂ = 0, where I₂ is the identity 2×2 matrix.

a) c₁ = -7, c₂ = -5
b) c₁ = -6, c₂ = -4
c) c₁ = -5, c₂ = -3
d) c₁ = -4, c₂ = -2