Use a suitable identity to get each of the products:
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a) p²-121
b) 4y²-25
c) 144a²-81
d) 4a²-2a+1/4
e) 1.21m²-0.16
f) -a^4+b^4
g) 36x²-49
h) a²/4 - 2ca/4 - c²/4
i) p²/64 + 6pq/32 + 9q²/16
j) 9a²-81b²
k) 2a²-36a+162
l) 5x²y²-30xyz+45z²
m) 36x²+60xy+25y²
n) 81p²+144pq+16q²
o) x²-x+0.25
p) 4x²y²-20xy²+25y²
Hope it helps
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