Originally Posted by

**nuclear123** question : find and evaluate and compare DELTAy and dy

----------------------------------------------------------

given data:

y = x^(4)+1 x = -1 DELTAx=dx=.01

to obtain deltaY i use this equation

DELTAy = (fx+DELTAx)-f(x)

-----------------------------------------------

which when i plug in the above data i get....

DELTAy = -.99-0

DELTAy = -.99

----------------------------------------------------

the back of my book says DELTAy should be... -0.039

what am i doing wrong :/