Question

Resolva:
a) (x + y - 2)²=
b) (x + 2y - z)² =
c) (2x - 3y - 4z)²=

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Answer 1

a) x² + xy - 2x + y² + xy - 2y - 2x - 2y + 4

= x² + y² + 2xy - 4x - 4y + 4

b) x² + 2xy - zx + 2xy + 4y² - 2zy - zx - 2zy + z²

= x² + 4y² + z² + 4xy - 2zx - 4zy

c) 4x² - 6xy - 8zx - 6xy + 9y² + 12zy - 8zx + 12zy + 16z²

= 4x² + 9y² + 16z² - 12xy - 16zx + 24zy