## Elementary Algebra

$= -3x^{3} - 5y^{3}$
1. Rewrite the order of the expression in order to ease simplification: $5x^{3} + 9y^{3} - 8x^{3} - 14y^{3}$ $= 5x^{3} - 8x^{3} + 9y^{3} - 14y^{3}$ 2. Use the distributive property $= x^{3}(5 - 8) + y^{3}(9 - 14)$ $= x^{3}(-3) + y^{3}(-5)$ $= -3x^{3} - 5y^{3}$