Differential Calculus

Hey guys, I need an answer to this by tomorrow. I need to know the answer to this question and the working out of it.

Thanks in advance :)


(a) Find dy/dx if y = 5x^-1/4

(b) (i) Find the equation of the tangent to the curve

y = x^2 - 5x + 7

at the point (1,3)

(ii) Hence find the area of the triangle formed by this tangent, the x axis and the y axis.

you duno how to do the first one?

bi) use dy/dx to find the tangent then sub x=1,y=3 into the equation to find the equation or c of the y=mx+c.

http://tutorial.math.lamar.edu/Class...s/eq0010MP.gif
http://tutorial.math.lamar.edu/Class...iles/empty.gif, n is any number.