p=2,q=-4and r=5 find the value of p²+q²+r²-2pq+2qr-2rp
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p²+q²+r²-2pq+2qr-2rp
=(2)²+(-4)²+(5)²-(2×2×-4)+(2×-4×5)-(2×5×2)
=4+16+25+16-40-20
=61-60
=1
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Answer:
4 +16+25+16+40+20=121 is the answer to the question
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