Question:
If x = 2, y = 3 and z = -5, then x^2 + y^2 +2z = ?
Answer:
[tex]x^2 + y^2 +2z =3[/tex]
Explanation:
Given
[tex]x = 2[/tex]
[tex]y = 3[/tex]
[tex]z = -5[/tex]
Required
Determine [tex]x^2 + y^2 +2z =[/tex]
[tex]x^2 + y^2 +2z =[/tex]
Substitute values for x, y and z in the above expression:
[tex]x^2 + y^2 +2z =2^2 + 3^2 + 2(-5)[/tex]
[tex]x^2 + y^2 +2z =2^2 + 3^2 - 2*5[/tex]
[tex]x^2 + y^2 +2z =4 + 9 - 2*5[/tex]
[tex]x^2 + y^2 +2z =4 + 9 - 10[/tex]
[tex]x^2 + y^2 +2z =3[/tex]
