Question 122681
{{{ (5x^2 + 2x - 3)-(2x^2 - 3x + 7) }}} Start with the given expression 




{{{ 5x^2 + 2x - 3-2x^2 +3x - 7 }}} Distribute the negative




{{{(5x^2-2x^2)+(2x+3x)+(-3+-7)}}} Group like terms



{{{3x^2+5x-10}}} Combine like terms




So {{{ (5x^2 + 2x - 3)-(2x^2 - 3x + 7) }}} simplifies to {{{3x^2+5x-10}}}