Answer and explanation:
[tex](6y^2-9y+4)-(-7y^2+5y+1)[/tex] multiply the - into [tex]-7y^2+5y+1[/tex]
[tex]6y^2-9y+4+7y^2-5y-1[/tex] Now add, or subtract, everything together.
[tex](13y^2-14y+3)[/tex] Answer
