Special Products · Exercise 54

Use the order of operations to show that ${\left(3+5\right)}^2$ is 64, and then use that numerical example to explain why ${\left(a+b\right)}^2\ne a^2+b^2$.

This is an open-ended exercise: its source gives no single answer.

OpenStax, Elementary Algebra 2e · §6.4 Special Products · Exercise 54