math question, plz help?

0 ⤊

the equation of the line tangent to the curve y= 4 sqrtX at the point (4,8) is ??

show steps plz
thanks

2007-06-25 12:52:42 · 3 answers · asked by Mr. Rain 1 in Science & Mathematics ➔ Mathematics

Stop cheating.

2007-06-25 13:00:08 · answer #1 · answered by A M 3 · 0⤊ 1⤋

y=4x^1/2
y' = 2/x^1/2
y' at (4,8) = 1
So y = x+b
8 = 4+ b
b=4
y=x+4

2007-06-25 20:05:39 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋

m=y'(4)=>m=1
y-8=x-4
y=x+4

2007-06-25 20:02:15 · answer #3 · answered by Alberd 4 · 0⤊ 0⤋