algebra · worked example

Solve x² - 16

Problem

$x^2 - 16$

Step-by-step solution

Распознайте $x^2 - 16$ как $a^2 - b^2$ с $a = x$ и $b = 4$ (так как $4^2 = 16$ ).
Примените тождество $a^2 - b^2 = (a-b)(a+b)$ .
Результат: $(x - 4)(x + 4)$ .

Answer

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

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