How do i solve x^3 (x-9) + (4x^3) don't give me the answer explain it

Not sure what you mean by "solve" it. It's just an expression. Using the distributive property, it expands to

x^3(x) - x^3(9) + 4x^3
Now just collect the x^3 terms

the website symbolab can help you with this, they give step by step explanations.

To solve the expression x^3(x-9) + 4x^3, we can follow these steps:

Step 1: Simplify the expression by applying the distributive property to the first term:
x^3(x-9) = x^3 * x - x^3 * 9 = x^4 - 9x^3

Step 2: Combine like terms by adding the simplified terms:
x^4 - 9x^3 + 4x^3

Step 3: Simplify the expression further by combining the terms with the same exponent (in this case, x^3):
x^4 + (-9 + 4)x^3 = x^4 - 5x^3

So, the simplified form of the expression x^3(x-9) + 4x^3 is x^4 - 5x^3.