X2 + 8x + 6

(x2 + 8x + ) + 6

What is the next step in the process, and what is the extreme value?

You could put the '+6' at the start of the equation so it would read as + 6 (x2+8x) and then expand the bracket as you normally would so you would get x2x6 which would get you 12x and then 6x8x which would get you 48x and then you could group both numbers together as they're like terms and your final answer would be 60x