factorise each of the following using suitable identities
a) (2x-y+z)^2
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Step-by-step explanation:
(2x−y+z)²
⇒A2+B2+C2=A2+B2+C2+2AB+2BC+2CA
⇒(4x2+y2+z2−4xz−2yz+4xz)
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