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Byju's Answer
Standard XII
Mathematics
Point of Inflection
Consider a fu...
Question
Consider a function f(x, y, z) given by
f(x, y, z) =
(
x
2
+
y
2
−
2
z
2
)
(
y
2
+
z
2
)
The partial derivative of this function with respect to x at the point, x = 2, y = 1 and z = 3 is
40
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Solution
The correct option is
A
40
f(x, y, z) =
(
x
2
+
y
2
−
2
z
2
)
(
y
2
+
z
2
)
f
(
x
,
y
,
z
)
=
x
2
y
2
+
y
4
−
2
y
2
z
2
+
x
2
z
2
+
y
2
z
2
−
2
z
4
∂
f
∂
x
=
2
x
y
2
+
0
−
0
+
2
x
z
2
+
0
−
0
At x = 2, y = 1 and z = 3:
∂
f
∂
x
=
2
(
2
)
(
1
)
2
+2(2)(3)
2
= 4 +36 = 40
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5
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