Question

Q.3
If A= x2 - xy + z, B = 3x2 + 4xy + 4z, C = 7x2 - 6xy - 72 then
find
(i) A+ B-C
(ii) A-B+C. kindly mention write answer aur copy pay krna plzzz​

Answer 1

$a \: = {x}^{2} - xy + z \\ b \: = 3 {x}^{2} + 4xy + 4z \\ c \: = 7 {x}^{2} - 6xy - 72 \\ \\ a + b - c \\ {x}^{2} - xy + z + 3 {x}^{2} + 4xy + 4z - 7 {x}^{2} + 6xy + 72 \\ {x}^{2} + 3 {x}^{2} - 7 {x}^{2} - xy + 4xy + 6xy + z + 4z + 72 \\ - 3 {x}^{2} + 9xy + 5z + 72$

Answer 2

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