## anonymous one year ago ....

1. IrishBoy123

squaring all that stuff and getting a negative number - holy moly!!

2. anonymous

Yeah its confusing

3. phi

first step $\frac{d}{dy}\left(5x^2 + y^4\right) = \frac{d}{dy}−9$

4. IrishBoy123

.

5. anonymous

Okay would I implicitly derive that?

6. mathmate

Actually what bugs me is (2,1) is not a point on the curve! Could it be that 5x^2 + y^4 = −19 and the point is (2i, 1)?

7. phi

good catch by mathmate. It does look like a typo. **Okay would I implicitly derive that?*** yes

8. phi

I would also double check the problem, because it looks like there are typos.

9. anonymous

Thats what the question says.