Find the least value of a such that the function f given by f(x)=x^2+ax+1 is strictly increasing....

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Class XII_ Monotonicity
Q100: Find the least value of a such that the function f given by f(x)=x^2+ax+1 is strictly increasing on (1, 2).

Previous recorded questions and their links:
Q64: Show that the function given by 𝒇(𝒙)=𝟕𝒙−𝟑 is strictly increasing on R.
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Q95: Show that f(x) = 〖tan〗^(–1) (sin⁡x + cos⁡x) is an increasing function on the interval (0,π/4).
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