1) = 4c^2 + 12c + 9 -( 9 - C^2)= 4c^2 + 12c + 9 - 9 +c^2 = 5c^2 + 12c
2) = x^12 / x^7 = x^5
1) (2c+3)^2-(3-c)*(c+3)=4c^2+12c+9-(9-c^2)=4c^2+12c+9-9+c^2=4c^2+12c+c^2=5c^2+12c
2) (x^12:x^6)^2/x^4*x^3=x^12/x^4*x^3=x^8*x^3=x^11
1) = 4c^2 + 12c + 9 -( 9 - C^2)= 4c^2 + 12c + 9 - 9 +c^2 = 5c^2 + 12c
2) = x^12 / x^7 = x^5
1) (2c+3)^2-(3-c)*(c+3)=4c^2+12c+9-(9-c^2)=4c^2+12c+9-9+c^2=4c^2+12c+c^2=5c^2+12c
2) (x^12:x^6)^2/x^4*x^3=x^12/x^4*x^3=x^8*x^3=x^11