x2 z = *1 - 2xy У

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter12: Sequences, Series And Binomial Theorem
Section12.4: Binomial Theorem
Problem 12.78TI: Find the coefficient of the x4 term of (x+2)7.
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Can you please explain why in this solution the dz/dy values become negative. Such as the -x and y^-2

x2
z = *1 - 2xy
y
Transcribed Image Text:x2 z = *1 - 2xy y
2 =
Z:
dy
dx
dz
dy
P
У
2
-
2
2 ху
2
1x
У
їху - гу
-
-х
2
-
- 2ху
І
-2
-
=) 2x
- гу
2
2х =) - - 2
уч
Transcribed Image Text:2 = Z: dy dx dz dy P У 2 - 2 2 ху 2 1x У їху - гу - -х 2 - - 2ху І -2 - =) 2x - гу 2 2х =) - - 2 уч
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