35. The value of VV256 + 181 is (a) 5 (b) 6 (C) 7 (d) 8
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Answer:
Given a=
6
+
5
;b=
6
−
5
Consider, 2a
2
−5ab+2b
2
=2(
6
+
5
)
2
−5(
6
+
5
)(
6
−
5
)+2(
6
−
5
)
2
=2(6+5+2
5
6
)−5(6−5)+2(6+5−2
6
5
)
=2(11)−5+2(11)=44−5=39
∴ 2a
2
−5ab+2b
2
=39
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