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06-04-2015, 07:00 PM
(This post was last modified: 09-01-2022, 01:04 AM by Fearless Community.
Edit Reason: Fixed Encoding
)
Yeah Jono that was it.
I factorised it to get (n+9)(n-10)=0
Then I worked out that n=10
If you then substitute 10 back into the equation it works:
10² - 10 - 90 = 0
100 - 10 - 90 = 0
90 - 90 = 0
That was for part b) of the question. I had no idea how to do part a)
I factorised it to get (n+9)(n-10)=0
Then I worked out that n=10
If you then substitute 10 back into the equation it works:
10² - 10 - 90 = 0
100 - 10 - 90 = 0
90 - 90 = 0
That was for part b) of the question. I had no idea how to do part a)
![[Image: tgRQtsH.png]](https://i.imgur.com/tgRQtsH.png)