(iii) (p2 – q2r)2 + 2p2q2r
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Step-by-step explanation:
2(px2-px2r)+8p²r
2(px2-px2r+4p²r)
2(2p-2pr+4p²r)
2x2px(1-r+2pr)
4px(1-r+2pr)
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