Simplify the expression.

-x(3x-8)

-3x^2+8x

To simplify the expression -x(3x-8), you need to distribute the -x to both terms inside the parentheses:

=(-x * 3x) + (-x * -8)

Now multiply:

=(-3x^2) + (8x)

Thus, the simplified expression is -3x^2 + 8x.