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Question
If 2a2 - 3a + 15 < 20, then the solution set of 'a' for the inequality is
If 2a2 - 3a + 15 < 20, then the solution set of 'a' for the inequality is
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Solution
The correct option is B
Reverse Gear Approach
Substitute a value for "a” which is there in 2 answer options and not there in the other two
Take a=2
At a=2 LHS<RHS. Hence, options (c) & (d) can be eliminated
Answer can be option (a) or (b)
Now substitute a value which is there in option (b) and not in option (a). Put a =0
LHS<RHS. Hence, option (a) can also be eliminated. Answer is option (b)
Reverse Gear Approach
Substitute a value for "a” which is there in 2 answer options and not there in the other two
Take a=2
At a=2 LHS<RHS. Hence, options (c) & (d) can be eliminated
Answer can be option (a) or (b)
Now substitute a value which is there in option (b) and not in option (a). Put a =0
LHS<RHS. Hence, option (a) can also be eliminated. Answer is option (b)
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