Help with this question.

I'm a bit stuck on this MAT question.

https://gyazo.com/99a4067810c8c1a7e760783c44ff851f

Here is my working.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xap1/v/t34.0-12/12179914_438529386343048_1020114142_n.jpg?oh=0829297509a258cb8f2fcf6d2b9e89ff&oe=562EC9A8

I got the right answer however I think it was by chance and not because I did it correctly. Please help!

I'm a bit stuck on this MAT question.

https://gyazo.com/99a4067810c8c1a7e760783c44ff851f

Here is my working.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xap1/v/t34.0-12/12179914_438529386343048_1020114142_n.jpg?oh=0829297509a258cb8f2fcf6d2b9e89ff&oe=562EC9A8

I got the right answer however I think it was by chance and not because I did it correctly. Please help!

as most of us do not have intuitive/working experience in the transformation y=f(x²) form the equation of the curve between -1 and 1

then replace x by x² -1 and then it will be obvious

I understand how you could let f(x) = -|x| +1 and therefore f(x^2 -1) = -|x^2 -1| + 1, however this test only includes C1 - 2 content so using C3 feels like cheating. The mark scheme has a different way of doing it however I don't really understand it.

https://gyazo.com/a152f9c12d1d02d032a5387bbaa02bee

Thanks TeeEm!

Fair enough.

(I thought maths is maths. I guess Maths did not know that this is C3, but next time I see maths I will let maths know.)

Do you understand the solution in the mark scheme (the one I linked)? Doesn't make sense to me.