\(63^2-47^2\)
= \(\left(63-47\right)\left(63+47\right)\)
= \(16.110\)
= \(1760\)
a) \(63^2-47^2=\left(63-47\right)\left(63+47\right)=16\cdot110=1760\)
b) \(215^2-105^2=\left(215-105\right)\left(215+105\right)=35200\)
c) \(437^2-363^2=59200\)
d) \(537^2-463^2=74000\)