Multiply :
5a - 1 by 7a - 3
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(5a - 1) x (7a - 3)
= 5a x (7a - 3) - 1 x (7a - 3)
= 5a x 7a - 5a x 3 - 1 x 7a - 1 x (-3)
= 35a(1+1) - 15a - 7a + 3
= 35a2 - 22a + 3
Hence, (5a - 1) x (7a - 3) = 35a2 - 22a + 3
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