Выражение. (m+4)^2-4(m+1)^2. 5(3-5x)^2-5(3x-7)(3x+7). (x-1)^2-4(x+1)^2-6(x+1)(x-1)

(m+4)^2-4(m+1)^2=m^2+8m+16-4(m^2+2m+1)=m^2+8m+16-4m^2-8m-4=-3m^2+12
5(3-5x)^2-5(3x-7)(3x+7)=5(9-30x+25x^2)-5(9x^2-49)=45-150x+125x^2-45x^2+245=80x^2-150x+300
(x-1)^2-4(x+1)^2-6(x+1)(x-1)=x^2-2x+1-4(x^2+2x+1)-6(x^2-1)=x^2-2x+1-4x^2-8x-1-6x^2+6=-9x^2-10x+6