- #1
DeanBH
- 82
- 0
I did a past paper question whereby I carried the answer (X+5)-6 through.
it then asked for the minimum points of the graph y=x^2 + 10x + 19. which is what i made into (X+5)-6.
I know i have to take the +5 and change its sign to -. and that's the minimum of X. and the -6 without change is the minimum of Y.
I just wondered, can anyone explain to me why this is so?
Furthermore, what would I do if it asked for a maximum. I would show an attempt, but i don't even understand why this is a minimum so it's hard for me to find out the maximum.
( this isn't actually a question I'm just interested.)
thanks :P
it then asked for the minimum points of the graph y=x^2 + 10x + 19. which is what i made into (X+5)-6.
I know i have to take the +5 and change its sign to -. and that's the minimum of X. and the -6 without change is the minimum of Y.
I just wondered, can anyone explain to me why this is so?
Furthermore, what would I do if it asked for a maximum. I would show an attempt, but i don't even understand why this is a minimum so it's hard for me to find out the maximum.
( this isn't actually a question I'm just interested.)
thanks :P