eastbryson eastbryson

03-09-2021
Mathematics

contestada

Factor completely. x2 - 400 (x + 20) (x - 20) 0 (x + 4)(x + 100) 0 (x + 25)(x - 16) (x - 50) (x +8) plz

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Аноним Аноним

03-09-2021

[tex]\\ \sf\ast\Rrightarrow x^2-400[/tex]

[tex]\\ \sf\ast\Rrightarrow (x)^2-(20)^2[/tex]

a^2-b^2=(a+b)(a-b)

[tex]\\ \sf\ast\Rrightarrow (x+20)(x-20)[/tex]

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aniilsah555 aniilsah555

03-09-2021

Step-by-step explanation:

x²-400
(x)²-(20)²

By the formula, [a²-b²=(a+b)(a-b)]

(x+20)(x-20)

Hence, first option is correct

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