(i) (x + y + z)(x + y - z)
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(x + y + z)(x + y - z)
= [(x + y) + z] * [(x + y) - z]
= (x + y)^2 - z^2
= x^2 + y^2 + 2xy - z^2 ——> Answer
= [(x + y) + z] * [(x + y) - z]
= (x + y)^2 - z^2
= x^2 + y^2 + 2xy - z^2 ——> Answer
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