ok what about this one f(x)=2x^2-8x+13

Question

dumbcow · Answer

Since its in standard form, use $$x = -\frac{b}{2a}$$ for line of symmetry, then substitute it back in to find y to determine the vertex

anonymous · Answer

i think 1 would be-2

dumbcow · Answer

be careful with the neg signs
a double neg makes a positive

anonymous · Answer

so then 2

dumbcow · Answer

yes, now plug it back in to get y

anonymous · Answer

which would be a minimum value?

dumbcow · Answer

correct because the "x^2" coefficient is positive

anonymous · Answer

5 for y which would be theline of symetry

dumbcow · Answer

good, line of symmetry is always vertical so it will be "x="

anonymous · Answer

5

dumbcow · Answer

so vertex is at (2,5)
graph goes upward
draw a straight vertical line through vertex
there is your line of symmetry

anonymous · Answer

what would the graph for this one look like

anonymous · Answer

it would not be downward

dumbcow · Answer

positive means up, negative means down
it might help to plot another point
try x = 1, y = 7
so plot a point at (2,5)
then another point at (1,7)
its symmetric so a 3rd point at (3,7)
then draw a parabola going through these 3 points
theres your graph