The error Sam made in trying to evaluate the expression is "Sam forgot to multiply".
How to evaluate algebraic expression
Given expression:
x²y = 49
When,
x = 7, y = 9
Check if correct:
- Substitute the value of x and y into the expression
x²y
= x² × y
= 7² × 9
= (7 × 7) × 9
= 49 × 9
= 441
Therefore, the evaluation of the algebraic expression x²y when x = 7 and y = 9 is 441
Learn more about algebraic evaluation:
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