Question

помогите , прошу. :(
алгебра.

Answer 1

$-(c+5)^2-(c-4)(c+3)=-(c^2+10c+25)-(c^2+3c-4c-12)= \ \ =-c^2-10c-25-c^2-3c+4c+12=-2c^2-9c-13$