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3 . 2 is the answer
4 . 17xy + yz - 6zx
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Answer:
3) 2
4) 6zx - yz - 17xy
Step-by-step explanation:
(3) x² +xy +y²z = (-2)² + (-2)(-1) + (-1)²(-4)
= 4 + 2 - 4 = 2
(4) (3yz+zx-14xy ) - ( 3xy+4yz-5zx)
=> 3yx+zx-14xy - 3xy -4yz + 5zx
= 6zx - yz - 17xy
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