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[answered] Both questions are find the vertex. But in Number 7 he goes


Both questions are find the vertex. But in Number 7 he goes from?

y = 4(x2 ? 2x) + 6?

Right to?

= 4(x2 ?2x+1?1)+6

He added +1 -1, which is half of the 2x.?


But for number 9 he went from

=?2(x2 +4x)?7

to?

=?2(x2 +4x+4?4)

where he added +4 -4, which isn't half of 4x. Shouldn't it be +2-2??

Thank you?


 


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