Question

2
3. If x= 1, y = -2 and z = -1, find the value of x²-2y²+4z²-xyz
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Answer 1

Answer:

-5

Step-by-step explanation:

put the values of x,y and z

1×1-2×(-2×-2)+4×(-1×-1)-1(-2)(-1)

1-2×4+4×1-2

1-8+4-2

5-10

-5

Answer 2

Answer:

There is answer in the image