Determine without graphing the quadratic function if it has min/max value and how to find it's value

Determine, without​ graphing, whether the given quadratic function has a maximum value or a minimum value and then find the value.<br /><br />f(x)=2x^2+8x-1<br /><br /><br />> if you would like to watch this content on YouTube. : https://youtu.be/2y7LYphgfuA?si=1rFLIdIrd_H-eZzP<br /><br />Thanks For Watching :)