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# c1 sketching curves watch

1. Question:
Find the possible values of a for which is a tangent to .

I still cant find a find to get to the answers of -10, 2

Attachment 556475556477

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2. (Original post by bigmansouf)
Question:
Find the possible values of a for which is a tangent to .

I still cant find a find to get to the answers of -10, 2

Attachment 556475556477

If

then

Just like e.g.
3. (Original post by bigmansouf)
Question:
Find the possible values of a for which is a tangent to .

I still cant find a find to get to the answers of -10, 2
When you were finding b^2, you made a mistake.
I think you should expand the brackets first, - (4+a) first = -4 + 4a and then square them.
Or, do exactly what notnek said - think of it like that, if you find it easier - rearrange the 4 + a to a + 4 so it matches (x+a)^2 and solve it like that.
4. (Original post by Chittesh14)
When you were finding b^2, you made a mistake.
I think you should expand the brackets first, - (4+a) first = -4 + 4a and then square them.
Or, do exactly what notnek said - think of it like that, if you find it easier - rearrange the 4 + a to a + 4 so it matches (x+a)^2 and solve it like that.
(Original post by notnek)
If

then

Just like e.g.
thank you i looked through my work and realised i did a mistake
5. (Original post by bigmansouf)
thank you i looked through my work and realised i did a mistake
No problem .

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