what is the maximum or minimum value of x^2-4x+9

a. the maximum value is 5
b. the maximum value is -5
c. the minimum value is -5
d. the minimum value is 5

Question

what is the maximum or minimum value of x^2-4x+9

a. the maximum value is 5
 b. the maximum value is -5 
c. the minimum value is -5 
d. the minimum value is 5

mertsj · Answer

Do you understand that that is the equation of a parabola?

anonymous · Answer

yea i got the graph ive just forgotten b/c my darn computer lost all the notes ive typed :/

anonymous · Answer

So, like Mertsj said, you know that a parabola have only one minimum/maximum which depend on its orientation (coefficient of x^2 positive or negative will answer this).

mertsj · Answer

Well if you have the graph, look at it.  Does it have a high point or a low point?

anonymous · Answer

its low

mertsj · Answer

Is it at 5 or -5?

anonymous · Answer

its 5 but minimum right?

mertsj · Answer

then choose minimum at 5

anonymous · Answer

o gotcha, this other person here who tryed helping me said stuff about something being opposite n im terrible at alg. 2 sorry, n thanks