Question

4x(3x - 2y) - (10y - 0,4)² Помогите

Answer 1

$12 {x}^{2} - 8xy - 100 {y}^{2} + 8y - 0.16$

Answer 2

$4(3x - 2y) - (10y - 0.4 {)}^{2} = \\ 12x - 8y - ((10y {)}^{2} - 2 \times 10x \times 0.4 + 0 {.4}^{2} = \\ 12x - 8y - (100 {y}^{2} - 8x + 0.16) = \\ 12x - 8y - 100 {y}^{2} + 8x - 0.16 = 12x - 100 {y}^{2} - 0.16$