A) 3
B) 4
C) 5
D) 6
Correct Answer: B
Solution :
(b): \[{{\left( {{x}^{2}}-x \right)}^{2}}\] By physical inspection and mental calculation, we can see that highest term will be \[={{x}^{4}}=4\Rightarrow degree=4,\] ALITER, by actual calculation \[{{({{x}^{2}}-x)}^{2}}={{\left[ x(x-1) \right]}^{2}}\] =\[{{x}^{2}}{{(x-1)}^{2}}\] \[{{x}^{2}}({{x}^{2}}-2x+1)\] \[{{x}^{4}}-2{{x}^{3}}+{{x}^{2}}\] So we get, \[\to {{x}^{4}}\] as highest term \[\Rightarrow \] Degree = 4.
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