Explicación paso a paso:
Okay, let's solve this in a more concise way:
(4x³ + x²) × (x - 1)
= 4x³(x - 1) + x²(x - 1)
= 4x⁴ - 4x³ + x³ - x²
= 4x⁴ - 3x³ - x²
