Page 8 of 8 · 47 explainers
Knowledge base
More explainers from the knowledge base. Each one names what you need to know first, works through the method, and says where it usually goes wrong.
Examples AlgebraFactoring Examples: 10 Worked ProblemsTen expressions, ordered so each one needs exactly one method more than the last.
Mistakes Algebra5 Common Factoring Mistakes and How to Catch ThemEvery one of these is caught by expanding the answer. Ten seconds, and it tests the result rather than the search.
Concept Basic MathWhat Is a Square Root? Perfect Squares and SurdsA square root undoes squaring. Everything awkward about them comes from the fact that squaring throws away the sign.
Examples Basic MathSquare Root Examples: 10 Worked ProblemsTen roots, ordered so each adds one difficulty. The last three are where surds stop being arithmetic and start being algebra.
Mistakes Basic Math5 Common Square Root MistakesFour of the five are caught by comparing your answer's decimal with the original. It takes five seconds.