(5x raise to power 3 3x raise to power 2 -2x 6) (x square 4x square -3x 1)?
Are you really missing a + key? I shall assume you mean
(5x^3 + 3x^2 - 2x + 6)(x^3 + 4x^2 - 3x + 1)
If all you want to do is multiply polynomials, take a look at
https://www.wolframalpha.com/input/?i=%285x%5E3+%2B+3x%5E2+-+2x+%2B+6%29%28x%5E3+%2B+4x%5E2+-+3x+%2B+1%29