"The most powerful single idea in mathematics is the notion of a variable."
– K. Dewdney

# Algebra 1

## Android Apps

• Number Explorer App version 1.1 – Explore numbers: prime factorization, divisibility, find all factors, greatest common factor and least common multiple.
• Quadratic Function App version 2.3 – Work with quadratic functions: various forms, complete the square, get decimal and exact (real or complex) zeros, transformations, domain, range, axis of symmetry, intercepts, end behavior, graph the function and more.

## Sample Problems

The value of reviewing these sample problems and solutions is twofold. The more obvious benefit relates to problems that a student has difficulty solving themselves; a solution is provided. Less obvious is the set of techniques used in our solutions; some of the techniques used on the sample problems may not be taught in the classroom. We concentrate on efficient solutions and shortcuts; so a review of the solved problems may present new techniques that enable a student to be more efficient in their approach to solving problems.