multiply 7xyz ( 8xy+5xz-7yz) and evaluate for x=1,y=-1,z = -2
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Hola
Here is ur answer
7xyz ( 8xy + 5xz - 7yz)
= 56x²y²z + 35x²z²y - 49y²z²x
Given - x = 1 y = -1 and z = -2
so - 56x²y²z + 35x²z²y - 49y²z²x
= 56(1)²(-1)²(-2) + 35(1)²(-2)²(-1) -
49(-1)²(-2)²(1)
= 56(1) (1) (-2) + 35(1) (4) (-1) - 49(1) (4) (1)
= -112 - 140 -196
= -252 -196
= -448
as - + - => add and sign is -
Final answer -
-448
Here is ur answer
7xyz ( 8xy + 5xz - 7yz)
= 56x²y²z + 35x²z²y - 49y²z²x
Given - x = 1 y = -1 and z = -2
so - 56x²y²z + 35x²z²y - 49y²z²x
= 56(1)²(-1)²(-2) + 35(1)²(-2)²(-1) -
49(-1)²(-2)²(1)
= 56(1) (1) (-2) + 35(1) (4) (-1) - 49(1) (4) (1)
= -112 - 140 -196
= -252 -196
= -448
as - + - => add and sign is -
Final answer -
-448
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