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Question

The value of the expression x48x3+18x28x+2 when x=2+3 is:

A
2
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B
1
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C
0
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D
3
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Solution

The correct option is C 1
x=2+3
or (x2)2=3
or x24x+1=0(1)
or (x2)4=9
or x48x3+24x232x+16=9
or x48x3+18x28x+2+6(x24x+1)1=0
Using (1), we get
x48x3+18x28x+2=1

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