Applying the law of exponent in algebraic expression, add or subtract the numerical coefficients of like terms or those with the same variables and their corresponding exponents (same literal coefficients)
2x² + x² = 3x² (Add the numerical coefficient only)
3x² - x² + x = 2x² + x
Another rule applies in multiplication and division:
In multiplication, add the exponents of the same variables.
(x²) (x³) = x² ⁺ ³ = x⁵
In division, subtract the exponents:
x⁵ ÷ x⁶ = x⁵⁻⁶ = x⁻¹ or