### Home > AC > Chapter 13 > Lesson 13.RE2-S > Problem 2-135

2-135.

Try substituting numbers for *x* and simplifying each expression. 0 and 1 can give different results, so check them as well as other numbers.

These two expressions are not equivalent. (But if you had only used 0 you might have thought they were).

Multiply and simplify.

These two expressions are equivalent.

See part (a).

Remember that (*x* + 4)^{2} means (*x* + 4)(*x* + 4) and multiply.

These two expressions are equivalent.

Simplify the first expression and compare. Be sure you read the hint in part (b).

Try substituting numbers for *a* and *b*.