4(a-1)^2+(a-2)(6-a)-135(a-4)2-(a-4)(7-3a)+20a^2

Question

4(a-1)^2+(a-2)(6-a)-13
5(a-4)2-(a-4)(7-3a)+20a^2

Answer 1

4(a²-2a+1)+(6a-a²-18+2a)-13= 4a²-8a+4+8a-18-a²-13=3a²- 24, a eto esli nado 3(a²-8)