Question

The solution set of $x^2+4x+9\ge 0$ is

• A. $\varphi \left(\text{empty set}\right)$
• B. $R$
• C. $[-3,4]$
• D. $[0,\infty )$

Answer 1

The correct option is B $R$

$x^2+4x+9\ge 0\Rightarrow (x+2{)}^2+5\ge 0\Rightarrow x\in R$