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Question

Evaluate the algebraic expression ax2+by2cz2,

for x=1, y=1, z=2, a=2, b=1 & c=2

A
5
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B
-9
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C
7
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D
11
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Solution

The correct option is C 7
Given expression is ax2+by2cz2,

Substituting the value of
x=1, y=1, z=2, a=2, b=1 & c=2
in the above expression, we get

=(2)(1)2+1(1)2(2)(2)2
=2+1+8
=7

The value of ax2+by2cz2 when x=1, y=1, z=2, a=2, b=1 & c=2 is 7.

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