Hi,

 = (3x - y + 4z)(3x - y + 4z)

                 = 3x(3x - y + 4z)-y(3x - y + 4z)+4z(3x - y + 4z)

                 = 9x^2 - 3xy +12xz - 3xy + y^2 - 4yz + 12xz - 4yz + 16z^2

Yes Good work!   = 9x^2 + y^2 + 16z^2 - 6xy + 24xz - 8yz  

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