Question:
Find the product:
(5x + 7) × (3x + 4)
Solution:
By horizontal method:
$(5 x+7) \times(3 x+4)$
$=5 x(3 x+4)+7(3 x+4)$
$=15 x^{2}+20 x+21 x+28$
$=15 x^{2}+41 x+28$
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