Removing brackets is to multiply the term outside the brackets by each term inside - also known as the distributive law. Use FOIL to remove a pair of brackets then simplify by collecting like terms.

A mathematical proof is a sequence of statements that follow on logically from each other that shows that something is always true. Using letters to stand for numbers means that we can make statements ...

The seventh-grade boy looked down at his blank work sheet, unsure how to begin solving the multistep algebraic equation that the teacher had written on the white board. After a moment’s hesitation, he ...