Let z(x, y) = 4x² +9y² where x = = -3s- 2t & y = 5s - 4t. dz ду Әх дудх მs’ მs’ მt Əs Ət Calculate Əz Əs Əz Ət & əz Ət by first finding Question Help: Video Submit Question & and using the chain rule.

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