Question

p=2,q=-4and r=5 find the value of p²+q²+r²-2pq+2qr-2rp​

Answer 1

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

Answer 2

Answer:

4 +16+25+16+40+20=121 is the answer to the question