Question

How do you evaluate `\sqrt { 25} - 9\cdot 2^ { 3}`?

Answer 1

The answer is `-67`.

Explanation:

Order of operations precedence rules say to evaluate the power `2^3` before multiplying it by 9, so `9*2^(3)=9*8=72`.

Since `sqrt(25)=5` (take just the positive square root when you see this symbol in this context), it follows that `sqrt(25)-9*2^(3)=5-72=-67`.