Question

Evaluate :
x power 2 - y power 2 - z power 2 for x=9,y=-7 and z=3​

Answer 1

x = 9

y = -7

z = 3

${x}^{2} - {y}^{2} - {z}^{2} \\ = {9}^{2} - {( - 7)}^{2} - {3}^{2} \\ = 81 - 49 - 9 \\ = 23$