A) \[10{{w}^{3}}+10{{w}^{2}}+30w+30\]
B) \[10{{w}^{3}}+10{{w}^{2}}-30w+30\]
C) \[10{{w}^{3}}-10{{w}^{2}}-30w+30\]
D) None of these
Correct Answer: C
Solution :
\[A+B-C=(10{{w}^{3}}+20{{w}^{2}}-55w+60)\] \[+(-25{{w}^{2}}+15w-10)-(5{{w}^{2}}-10w+20)\] Bring all the like terms together, we get \[A+B-C=10{{w}^{3}}+(20{{w}^{2}}-25{{w}^{2}}-5{{w}^{2}})\] \[+(-55w+15w+10w)+(60-10-20)\] \[=10{{w}^{2}}-10{{w}^{2}}-30w+30\]
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