What do we get after expanding (p+3q-2z)2?

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answerhappygod
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What do we get after expanding (p+3q-2z)2?

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a) p2 + 9q2 + 4z2 + 6pq – 12qz + 4zp
b) p2 + 9q2 + 4z2 + 12pq + 12qz + 4zp
c) p2 + 9q2 + 4z2 – 12pq – 12qz – 4zp
d) p2 + 9q2 + 4z2 + 6pq – 12qz – 4zp
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