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CBSE Class 12-science Answered

10th sum 
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Asked by lovemaan5500 | 08 Feb, 2020, 09:30: PM
answered-by-expert Expert Answer
Given that f(x) = x2 + ax + 1 is increasing when x ε (1, 2)
f'(x) > 0
2x + a > 0 
2x > -a
x > -a/2
Put x = 1 we get a > -2
Put x = 2 we get a > -4
when a > -2 function is strictly increasing on (1, 2)
At least value of a is -2.
Answered by Sneha shidid | 10 Feb, 2020, 09:12: AM

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