Simplify the algebraic expression by combining like terms.-6x² -12x²
-18x²
To simplify the algebraic expression -6x² - 12x² by combining like terms, we can add the coefficients of the terms with the same variable raised to the same power.
Therefore, combining -6x² and -12x², we get (-6 - 12)x².
Simplifying further, the expression becomes:
-18x²