Question

Find the least value of 'a' such that f(x)=x^2 + ax+1 is strictly increasing in (1,2) is ?

Answer 1

@RadEn @amistre64

Answer 2

strictly increasing means f'(x)>0 in (1,2)
so 2x+a>0
so a have to be bigger than -2. This also means that there is no least value of a in the set a>-2

Answer 3

that make sense..thxx

Answer 4

yw