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Question
Write in the expand form: `(2x - y + z)^2`
Solution
`(2x - y + z)^2 = [(2x) + (-y) + z]^2`
`= (2x)^2 + (-y)^2 + (z)^2 + 2(2x)(-y) + 2(-y)(z) + 2(2x)(z)`
`= 4x^2 + y^2 + z^2 + 4x(-y) - 2yz + 4xz`
`∴ (2x - y + z)^2 = 4x^2 + y^2 + z^2 - 4xy - 2yz + 4xz`
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