The Student Room Group

Completing the square

What am I doing wrong?

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The answer is supposed to be Answer.gif
Reply 1
Original post by zed963
What am I doing wrong?

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The answer is supposed to be Answer.gif


The square of 4 is also multiplied by 2
Original post by zed963
What am I doing wrong?

Question.gif

The answer is supposed to be Answer.gif


Your -16 seems to have slipped out of a bracket.
Reply 3
Original post by joostan
The square of 4 is also multiplied by 2


Why is this?
Reply 4
Original post by zed963
Why is this?


As Mr M says,
your bracket should read:
2{(x+4)^2-16}
Reply 5
Original post by joostan
As Mr M says,
your bracket should read:
2{(x+4)^2-16}


And if we want to bring it out of the bracket we have to times it by 2?
Reply 6
Original post by zed963
And if we want to bring it out of the bracket we have to times it by 2?


Precisely :smile:
Reply 7
Original post by joostan
Precisely :smile:


Oh okay, thank you all very much.

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