Primary SchoolLesson 2/3 · Expressions and Fractions~11 min

Expanding Binomials

The distributive law, products of binomials and key formulas

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Problem

(x + 3) (x - 5)

x \cdot x + x \cdot (- 5)

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$(x + 3) (x - 5) \neq = x^{2} - 15$
Multiplying only the first and last terms is not enough - all four products are needed.