Question

Find the weature 3x² + x²y + y² + xy² for
X = -2 y=5​

Answer 1

$= 3 {x}^{2} + {x}^{2} y + {y}^{2} + x {y}^{2} \\ = 3( - 2 {)}^{2} + ( - 2 {)}^{2} \times 5 + (5 {)}^{2} + ( - 2) \times {5}^{2} \\ = 3 \times 4 + 4 \times 5 + 25 +( - 2) \times 25 \\ = 12 + 20 + 25 - 50 \\ = 57 - 50 \\ = 7$