A) 1.6
B) 2
C) 3
D) 0
Correct Answer: A
Solution :
(a): \[a+b=5\] While \[{{a}^{3}}+{{b}^{3}}=\left( a+b \right)\left( {{a}^{2}}-ab+{{b}^{2}} \right)\] \[\Rightarrow 8=5({{a}^{2}}-ab+{{b}^{2}})\] \[\therefore \left( {{a}^{2}}-ab+{{b}^{2}} \right)=\frac{8}{5}=1.6\]You need to login to perform this action.
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