Question

The inequality $b^2+5>9b+12$ is satisfied if :

• A. $b>9$ (or) $b<1$
• B. $b>9$ (or) $b<0$
• C. $b=10$ (or) $b=-1$
• D. None of these

Answer 1

The correct option is D None of these

Given equation is :

$b^2-9b-7<0$

Roots of above equation are (9.72,-0.72)

We can see in above equation, equation is positive when b>9.72 or b<-0.72

$\therefore b>9.72$ or $b<-0.72$