Hi (5-3x^2 )-(5x^2+3)-(7+x^2 ) Removing Parenthesis 5 -3x^2 - 5x^2 -3 -7 -x^2 combine Like terms to simplify -3x^2 - 5x^2 -x^2 -3 -7 + 5 -9x^2 -5 0r -(9x^2 + 5)