The vector that is normal to the surface 2xz2 – 3xy – 4x = 7 at the point (1, -1, 2) is

1
2î  – 3ĵ  + 8k̂ 
2
2î  + 3ĵ  + 4k̂ 
3
7î  - 3ĵ  +8k̂ 
4
7î  – 5ĵ  + 8k̂ 

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