The Nth Term of Quadratic Sequences

GCSE Maths revision tutorial video.

[gunspep]

Bro made me understand the topic in 9 minutes more than my teacher in 2 weeks

[coathanger]

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[tandynyawanza]

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[Laura-qrgo]

I have a huge exam coming up and this helped me so much, my maths teacher is terrible she makes it sound so complicated and I didn’t understand it at all

[dominikpierzchala]

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[x_lucidafton_x]

I appreciate the effort you put into making this, I now understand the format of these types of questions. Thank you & I wish you well.

[floriankreppner]

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[ianthe]

binge watching loads of these videos the night before my non-calc. maths gcse paper - you might save my grade!!!

[_CertifiedHoodClassic]

my teach taught this to me in year 9. i was top set, and pretty lazy, so my attention span those lessons was... lackiing. Ever since, its been coming up in tests. end of topics, end of years, and i've just been crawling along, no sense of direction with the method. Of the many tutorials that i've found, this one clicked. Thanks!!!

[razzakgamingofficial]

I am in grade 7. I am going for the InIMC (India International Mathematics Competition) in 5 days. On the test deciding which 8 students are going, the first question had something about quadratic sequences. I didn't know what they were at the time, and got it wrong. I thought it was impossible, after watching this, I realise how UNBELIEVABLY EASY it was. Thank you so much for this amazing tutorial, you earned a subscriber. I genuinely love you for helping me so much. ❤❤❤

[felixfearon]

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[ayazali]

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[farifarii]

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[unironicirony]

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[OmarMohamed-vsuv]

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[Chickengbs]

Reading the comments, I see a few people getting confused on the last question where we "+1" so allow me to elaborate.

The reason the last part is "-2n+1", and not "-2n-1". The "+1", allow me to explain:

-1, -3, -5, -7, -9

We evaluate our sequence and observe how it's moving. The sequence is moving in the negative times 2 pattern so:

-2, -4, -6, -8, -10

Now lets write them both together,

-1, -3, -5, -7, -9 <- our sequence.

-2, -4, -6, -8, -10 <- negative 2x table.

Now you need to ask yourself, what change do we need to make to our sequence, for it to align with the negative 2 times table?


-1, -3, -5, -7, -9 <- our sequence.
-2, -4, -6, -8, -10 <- negative 2x table.

If we add +1 to our number sequence, they become:
0, -2, -4, -6, -8

Therefore, the answer is: +1

-2n + 1 (because we +1 to align with the times table)

That's it! :D

[lujaynmigdadi]

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[dumdumbanana]

bro u explained it better in 1 video than my teacher ever could

[digbypy]

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[tomekczerepinski]

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