Jiayang's answer to Mutya's International Baccalaureatte Maths SL question.

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Jiayang
Jiayang's answer
1883 answers (Tutor Details)
1st
Mutya
Mutya
6 years ago
Why should we equote wtv is in bracket to 0?
Jiayang
Jiayang
6 years ago
In this qn our curve the vertex is a min pt.

(x-1)² ≥ 0

In order to get a minimum value out of (x-1)², we see that we have to equate x-1=0.
Mutya
Mutya
6 years ago
Ok i understand now, thank you for your help
Wen Guotai Daniel
Wen Guotai Daniel
6 years ago
Hi Jiayang, Happy New Year to you and the students. Just wonder what device and app you are using to write the solutions. It's clear and pleasing to the eye. Care to share? Sorry I couldn't get to you by other means. Thanks & cheers.
Jiayang
Jiayang
6 years ago
Happy New Year Dan

You can find me on FB I guess haha
Usually I take a ss and there many apps that can do annotations, I use Notability but it's not free :o
Wen Guotai Daniel
Wen Guotai Daniel
6 years ago
Oh haha... thanks Jiayang, will do some search on the apps. I don't visit FB often these days though.
Wen Guotai Daniel
Wen Guotai Daniel
6 years ago
Ah btw, ss refers to Samsung right? I guess. Thanks.
Jiayang
Jiayang
6 years ago
NOOOOO!!!! Ss is screenshot
Wen Guotai Daniel
Wen Guotai Daniel
6 years ago
Oh I see. Got it. Haha... guess you use hand phone or tablet then. Thanks.
Jiayang
Jiayang
6 years ago
I use an iPad pro
Wen Guotai Daniel
Wen Guotai Daniel
6 years ago
Thanks. Figured out while Googling.