OpenStax, Prealgebra 2e §10.3 Multiply Polynomials · Exercise 72 · Algebra · Polynomials

Multiply Polynomials · Exercise 72

Mental math You can use binomial multiplication to multiply numbers without a calculator. Say you need to multiply $18$ times $17.$ Think of $18$ as $20 - 2$ and $17$ as $20 - 3.$

ⓐ Multiply $(20 - 2) (20 - 3)$ by the FOIL method.
ⓑ Multiply $18 \cdot 17$ without using a calculator.
ⓒ Which way is easier for you? Why?

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OpenStax, Prealgebra 2e · §10.3 Multiply Polynomials · Exercise 72

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