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Write the following in expanded form: (9...

Write the following in expanded form: `(9x+2y+z)^2` (ii) `(3x+2y-z)^2` `(x-2y-3z)^2` (iv) `(-x+2y+z)^2` `(1/4a-1/2b+1)^2` (iv) `(-2x+5y-3z)^2`

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