Question 30072
{{{ (5x^6 - 6x^5 - 9x^4 - 2) - (7x^6 + 4x^5 - 3x^4 - 3) }}} since the second term is preceeded by a negative, change all the signs in the second quantity and drop the parenthesis

{{{ 5x^6 - 6x^5 - 9x^4 - 2 - 7x^6 - 4x^5 + 3x^4 + 3 }}} combine x^6

{{{ highlight(5x^6) - 6x^5 - 9x^4 - 2 - highlight (7x^6) - 4x^5 + 3x^4 + 3 }}}
{{{ -2x^6 - 6x^5 - 9x^4 - 2 - 4x^5 + 3x^4 + 3 }}} combine x^5
{{{ -2x^6 - highlight (6x^5) - 9x^4 - 2 - highlight(4x^5) + 3x^4 + 3 }}}
{{{ -2x^6 - 10x^5 - 9x^4 - 2 + 3x^4 + 3 }}} combine x^4
{{{ -2x^6 - 10x^5 - highlight(9x^4) - 2 + highlight(3x^4) + 3 }}}
{{{ -2x^6 - 10x^5 - 6x^4 - 2 + 3 }}} combine constants
{{{ -2x^6 - 10x^5 - 6x^4 + 1 }}} since there is no = , this is a simpliflying problem