expond the following (4p-q+2r)^2
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(4p-q+2r)²
By using the identity (a+b+c)²
(4p)²+(-q)²+(2r)²+2x4px(-q)+2x4px2r+2x(-q)x2r
16p²+ q²+4r²-8pq+16pr-4qr
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