Hey can you me posted picture of question

-5x⁶ + 5x⁵ + 6x⁴ - 6x³

Explanation:
Before we begin, remember that:
xᵃ * xᵇ = xᵃ⁺ᵇ

Now for the given question:
To answer this question, we will multiply each term from the first bracket by each term from the second bracket and then combine like terms to get the final expression.

This can be done as follows:
(6 - 5x²)(x⁴ - x³)
6(x⁴) + 6(-x³) - 5x²(x⁴) - 5x²(-x³)
6x⁴ - 6x³ - 5x⁶ + 5x⁵

Rearrange from largest power to smallest one, we will get:
-5x⁶ + 5x⁵ + 6x⁴ - 6x³

Hope this helps :)