Use linear approximation to estimate the change, Δz, in z = 4x² y² as (x, y) changes from (3, 4) to (3.03, 4.06).

a) Δz ≈ 8.14
b) Δz ≈ 8.68
c) Δz ≈ 9.02
d) Δz ≈ 9.56

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