algebra · worked example

Solve x² - 16

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Problem

$x^2 - 16$

Step-by-step solution

$x^2 - 16$ 을 $a^2 - b^2$ 로 보고 $a = x$ , $b = 4$ 로 둡니다 ( $4^2 = 16$ 이므로).
항등식 $a^2 - b^2 = (a-b)(a+b)$ 를 적용합니다.
결과: $(x - 4)(x + 4)$ .

Answer

$(x - 4)(x + 4)$

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