Question

Упростите выражение
3a(a+2)-(a+3)^2
8c+4(1-c)^2
(a-4)^2-2a(3a-4)
(x-2)(x+4)-2x(1+x)
(d-4)(d+2)-(d-1)^2

Answer 1

1)=3a^2+6a-a2-6a+9= 2a^2-9
2)=8c+4(1-2c+c^2)=8c+4-8c+4c^2=4+4c^2
3)=a^2-8a+16-6a^2+8a=16-5a
4)=x^2+4x-2x-8-2x-2x^2=-x^2-8
5)=d^2+2d-4d-8-d^2+2d-1=-9