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02-08-2019
Mathematics

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Help! Which step is incorrect!

Help Which step is incorrect class=

Respuesta :

02-08-2019

Answer:

(2)

Step-by-step explanation:

Because

[tex]x^2-16=x^2-4^2=(x-4)(x+4)[/tex] not [tex]=(x-4)(x-4)[/tex]

This follows from the formula [tex]a^2-b^2=(a-b)(a+b)[/tex]

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