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Question

If 2a3=5
and 3b+1=2,
then find the value of (3b2a).

A
-3
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B
-7
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C
7
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D
- 9
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Solution

The correct option is B -7
2a3=52a=5+3a=82a=4

Also, 3b+1=23b=21b=13
Substituting the value of a and b, we get,

3b2a=3(13)2(4)3b2a=183b2a=7

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