Question

If x=1, y=2 and z= -3, Find the value of x² + xy – yz²

kindly solve this! ​

Answer 1

Good afternoon✌✌

the answer is - 15 and explaination is the attached picture....

Answer 2

x = 1, y = 2, z = -3

x² + xy – yz²

1² + (1 × 2) - 2 × (-3)²

1 + 2 - (2 ×9)

3 - 18

= -15