Question

If x = 1, y = 2 and z = 5, find the value of x² + y²+ z²

Answer 1

\[x^2 + y^2 + z^2 \]
Substituting x = 1, y = 2 and z = 5 in the given expression:
\[1^2 + 2^2 + 5^2 = (1 \times 1) + (2 \times 2) + (5 \times 5) = 1 + 4 + 25\]
\[ = 30\]