A) \[{{a}^{2}}+3ab-{{b}^{2~}}\]
B) \[6{{a}^{2}}-5ab\]
C) \[-3{{a}^{2}}-ab+6{{b}^{2}}\]
D) \[-{{a}^{2}}-2ab+2{{b}^{2}}\]
Correct Answer: D
Solution :
(d)\[-{{a}^{2}}-2ab+2{{b}^{2}}=-{{\left( -2 \right)}^{2}}-2\left( -2 \right)\left( 5 \right)+2\left( {{5}^{2}} \right)\]\[=-4+20+50=66\]
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