φ (x) = x ^ 4 + (2 - λ) x ^ 2 + 2 - λ, φ (x2) - φ (x1) = (x2 + x1) (x2-x1) (x2 ^ 2 + X1 ^ 2 + 2 - λ), what is the process of factorization What is the process, | Math enthusiast | Mathematical art

φ (x) = x ^ 4 + (2 - λ) x ^ 2 + 2 - λ, φ (x2) - φ (x1) = (x2 + x1) (x2-x1) (x2 ^ 2 + X1 ^ 2 + 2 - λ), what is the process of factorization What is the process,

φ(x2)-φ(x1)=x2^4-x1^4+(2-λ)(x2^2-x1^2)
=(x2^2-x1^2)(x2^2+x1^2+2-λ)
=(x2+x1)(x2-x1)(x2^2+x1^2+2-λ),
Is that OK?

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