14. 4(x- (17. x +x² + 1 [Hint: Add and subtract x2.]
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Correct option is C)
Given, x
4
+x
2
+1
=(x
2
)
2
+2(x
2
)(1)+1
2
−x
2
=(x
2
+1)
2
−x
2
=(x
2
+1−x)(x
2
+1+x)
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