Question 196843
{{{ (-3x^2-x-7) - (x^2+4x-9)}}} Start with the given expression.



{{{-3x^2-x-7-x^2-4x+9}}} Distribute



{{{(-3x^2-x^2)+(-x-4x)+(-7+9)}}} Group like terms



{{{-4x^2-5x+2}}} Combine like terms



So {{{ (-3x^2-x-7) - (x^2+4x-9)=-4x^2-5x+2}}}