Simplify the expression: 4x(-3x³ + 2x² - x)

To simplify the expression, distribute 4x to each term inside the parentheses:

\( 4x \cdot (-3x^3) = -12x^{1+3} = -12x^4 \)

\( 4x \cdot 2x^2 = 8x^{1+2} = 8x^3 \)

\( 4x \cdot (-x) = -4x^{1+1} = -4x^2 \)

Combining these terms, we get:

\( -12x^4 + 8x^3 - 4x^2 \)

Ответ: -12x⁴ + 8x³ - 4x².