Mathematics
Algebra
Procedural
13–14 yrs
Expanding Double Brackets
展开双括号
Description
Expand products of two or more binomials, e.g., (x + 3)(x - 2) = x² + x - 6, using the grid method or FOIL; simplify the result by collecting like terms
Mastery Evidence
- Expand the product of two binomials using a systematic method (grid or FOIL)
- Collect like terms after expansion to simplify the result
- Expand products involving negative terms correctly
Assessment Prompt
Can your child multiply out two brackets like (x + 3)(x − 2) and collect the terms to get x² + x − 6?
Prerequisites 2
Expanding Single Brackets
双括号展开是在单括号展开的基础上，运用FOIL法或网格法进行扩展
Collecting Like Terms
展开双括号后需要合并同类项以化简结果
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No follow-up topics
