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(a + b) . 2
=((2 x a) + (2 x b))
= 2a + 2b
B.
(a - b) . 2
= ((2 x a) - (2 x b))
= 2a - 2b
C.
(ax + b).(cx + d)
= (ax . cx) + (ax . d) + (b . cx) + (b . d)
= acx² + axd + bcx + bd