Question

x= -0.2
помогите пожалуйста​

Answer 1

3(4x – y)² – 2(x – y)(x + y) + 4(x + 3y)² = 3(16x² – 8xy + y²) – 2(x² – y²) + 4(x² + 6xy + 9y²) = 48x² – 24xy + 3y² – 2x² + 2y² + 4x² + 24xy + 36y² = 50x² + 41y²

Подставляем x = –0,2, y = –1:

50(–0,2)² + 41(–1)² = 50·0,04 + 41 = 2 + 41 = 43