Please help me gradient of tangent f(x)=ax^2+c dy/dx=2ax Point A (2,5) lies on the graph of y=f(x). the gradient of the tangent to this graph at A is 6. Find the value of a and c. 
Where are you having difficulty? The problem can be solved by straightforward substitution. $$f'(2)=2a(2) = 6$$ Can you continue? 
can you please finish it? I am not sure why, but I am so confused on finding both a and c. I have been doing math all day 
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