Question

Помогите пожалуйста срочно

Answer 1

1) = c^2 + 8 c + 16 + 9 - C^2 = 8C + 25 = -28 + 25 = -3

3) X = -5 -3y

4(-5-3y) -y = -7

-20 -12 y - y = -7

-13 y = 13

Y = -1

X = -2

4.1) = 7xy^2(x^4y -x -3)

4.2) a(3a-5)(3a+5)