2x^3+7x^3-18x-63
To simplify the expression 2x^3 + 7x^3 - 18x - 63, we can combine like terms.
The terms 2x^3 and 7x^3 are like terms because they both have the same variable raised to the same exponent (x^3). To combine them, we add their coefficients: 2 + 7 = 9. Therefore, the simplified expression becomes 9x^3.
The term -18x is a standalone term with a different exponent than the x^3 terms. So, we keep it as it is: -18x.
Lastly, -63 is also a standalone term with no variable. We keep it as it is: -63.
Putting it all together, the simplified expression is 9x^3 - 18x - 63.