Find the product:
(5x + 7) × (3x + 4)

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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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