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Home / x^4 + 4x^2 + 3 = (u^2 - 4u + 4) + 4(u - 2) + 3 = u^2 - 4u + 4 + 4u - 8 + 3 = u^2 - 1.

x^4 + 4x^2 + 3 = (u^2 - 4u + 4) + 4(u - 2) + 3 = u^2 - 4u + 4 + 4u - 8 + 3 = u^2 - 1.

February 22, 2026

x^4 + 4x^2 + 3 = (u^2 - 4u + 4) + 4(u - 2) + 3 = u^2 - 4u + 4 + 4u - 8 + 3 = u^2 - 1.

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x^4 + 4x^2 + 3 = (x^2)^2 + 4x^2 + 3.
Let $ u = x^2 + 2 $. Then $ x^2 = u - 2 $, and
Substituting into the expression:
f(u) = u^2 - 1.
Now substitute $ u = x^2 - 2 $ into $ f $:
f(x^2 - 2) = (x^2 - 2)^2 - 1 = x^4 - 4x^2 + 4 - 1 = x^4 - 4x^2 + 3.

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