Simplify:
(7x - 8) (3x + 2)
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= 7x (3x + 2) - 8 (3x + 2)
= 21x(1+1) + 14x - 24x - 16
= 21x2 + 14x - 24x - 16
= 21x2 - 10x - 16
Hence, (7x - 8) (3x + 2) = 21x2 - 10x - 16
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Multiply :
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5p2 + 25pq + 4q2 by 2p2 - 2pq + 3q2
(px - q) (px + q)
(5a + 5b - c) (2b - 3c)