Two ways of doing it;
(pi*7)^2 = 483.6106156533785723
pi*(7^2) = 153.9380400258998687
Please specify parentheses.
I agree, here, that the language is ambiguous, but you can specify, in words, which interpretation you want.
Expression | Words |
\(\pi*7^2\) | What is the product of pi and seven squared? |
\((\pi*7)^2\) | What is the quantity of pi multiplied by seven all raised to the second power? |
Generally, if you want to indicate parentheses, you will use the term "quantity of..."