Question

What is the solution set of the quadratic inequality?

Answer 1

Answer:

$\large\boxed{\{x\ |\ -\sqrt5\leq x\leq\sqrt5\}}$

Step-by-step explanation:

$x^2-5\leq0\qquad\text{add 5 to both sides}\\\\x^2\leq5\iff x\leq\sqrt5\ \wedge\ x\geq-\sqrt5\Rightarrow-\sqrt5\leq x\leq\sqrt5$