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

Answer 1

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

Answer 2

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

Answer 3

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).

Answer 4

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

Answer 5

its low

Answer 6

Is it at 5 or -5?

Answer 7

its 5 but minimum right?

Answer 8

then choose minimum at 5

Answer 9

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