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Help! Which step is incorrect!
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4 votes
Help! Which step is incorrect!

Help! Which step is incorrect!-example-1
User Will Croft
by
5.6k points

1 Answer

2 votes

Answer:

(2)

Explanation:

Because


x^2-16=x^2-4^2=(x-4)(x+4) not
=(x-4)(x-4)

This follows from the formula
a^2-b^2=(a-b)(a+b)

User WisZhou
by
6.3k points
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