(2x - 5)(3x + 1) :
= (2x × 3x) + (2x × 1) + (-5 × 3x) + (-5 × 1)
= (2 × 3 × x × x) + 2x + (-15x) + (-5)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5
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(2x - 5)(3x + 1) :
= (2x × 3x) + (2x × 1) + (-5 × 3x) + (-5 × 1)
= (2 × 3 × x × x) + 2x + (-15x) + (-5)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5