The product of 7x-4 and 8x+5 = 56x² + 3x - 20
7x-4 × 8x+5
Simplify,
= 7x (8x + 5) -4 ( 8x+5)
= 7x * 8x + 7x * 5 - 4 * 8x - 4*5
= 56x² + 35x - 32x - 20
= 56x² + 3x - 20
Therefore, the product of 7x-4 and 8x+5 = 56x² + 3x - 20
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