Question

Помогите решить пожалуйста

Answer 1

$4. \: 18x - 6 {x}^{2} = 0 \\ 6x(3 - x) = 0 \\ x = 0 \: x = 3 \\ \\ 5. \\ 4 {x}^{2} - a = {x}^{2} \\ a = {4}^{2} - {x}^{2} = 3 {x}^{2} \\ b - x = 2x \\ b = 2x + x = 3x \\ - 7 + c = 1 \\ c = 7 + 1 = 8$