n(-4n + 8 + 9) (have to simplify) | Mathematics | Page 1

fathom parrot Oct 11, 2022, 4:51 PM

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Just multiply everything in the brackets with n

reef cedar Oct 11, 2022, 4:51 PM

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Yeah I know that, why does it do power of 2 tho

fathom parrot Oct 11, 2022, 4:52 PM

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,tex $n\cdot-4n=-4\cdot n^{2}$

strange snowBOT Oct 11, 2022, 4:52 PM

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Jehare

reef cedar Oct 11, 2022, 4:53 PM

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And why does 2 come there

fathom parrot Oct 11, 2022, 4:53 PM

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Since by definition n*n=n²

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You know what squaring is?

reef cedar Oct 11, 2022, 4:53 PM

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Nope

fathom parrot Oct 11, 2022, 4:53 PM

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n times n is quickly notated by n²

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n times n times n equals n³

reef cedar Oct 11, 2022, 4:53 PM

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Ah ok thanks

fathom parrot Oct 11, 2022, 4:54 PM

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,tex $n\cdot n \cdot n = n^{3}$

strange snowBOT Oct 11, 2022, 4:54 PM

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Jehare

reef cedar Oct 11, 2022, 4:55 PM

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It would be -4n power of 2
So if n =2 then I would have to do 22 and -4-4 right?

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2x2

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-4x-4

fathom parrot Oct 11, 2022, 4:55 PM

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Stop

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No

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That'd be with

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,tex $(-4n)^{2}$

strange snowBOT Oct 11, 2022, 4:55 PM

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Jehare

fathom parrot Oct 11, 2022, 4:56 PM

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Here you do everything to the power 2, but

strange snowBOT Oct 11, 2022, 4:56 PM

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Jehare

reef cedar Oct 11, 2022, 4:57 PM

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Hmm

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Weird

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So 2x2?

fathom parrot Oct 11, 2022, 4:58 PM

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If we knew n=2, then

strange snowBOT Oct 11, 2022, 4:58 PM

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Jehare

reef cedar Oct 11, 2022, 4:58 PM

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How’s it get to -16

fathom parrot Oct 11, 2022, 4:59 PM

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,tex $-4n^{2}=-4 \cdot 2^{2} =-4\cdot 4 = -16$

strange snowBOT Oct 11, 2022, 5:00 PM

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Jehare

reef cedar Oct 11, 2022, 5:01 PM

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Oh

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If n was 5 then I would do…
5x5=25
-4x25=-100
Right?

fathom parrot Oct 11, 2022, 5:02 PM

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Correct

#n(-4n + 8 + 9) (have to simplify)