Each term in the second factor is multiplied by each term in the first factor, called the distributive law
x( - 4x² + 5 ) + 3( - 4x² + 5)
= - 4x³ + 5x + 3 - 12x² + 15
= + 3 - 4x³ - 12x² + 5x + 15 ← in standard form
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