i need help

Question

(3x^3+12x^2-10)-(5x^3-4x^2-x+5)= i do not understand how to do this

Answer 1

(3x³ + 12x² - 10) - (5x³ - 4x² - x + 5)         Given

3x³ + 12x² - 10 - 5x³ + 4x² + x - 5             Distributive property (first parenthesis by 1, second by -1)

3x³ - 5x³ + 12x² + 4x² + x - 10 - 5             Commutative property of addition (arrange terms by exponents)

-2x³ + 16x² + x - 15                                 Combine like terms to simplify