Question

Find the maximum or minimum of the following quadratic function: y =x2 - 10x + 25
A. 0
B. 25
C. -25
D. 50
how would you solve this?

Answer 1

the quadratic function above can be rewrite as :
y = x^2 - 10x + 25 (it is minimum because the coef of x^2 > 0)
y = (x - 5)^2 + 0

so, the minimum value is 0 when x = 5

Answer 2

and the maximum?

Answer 3

there two kinds of quadratic fucntion, max and minimum.
max when the coefficient of x^2 < 0 and
minimum when the coefficient of x^2 > 0

look at the quadratic above, y =x2 - 10x + 25
known the coefficient of x^2 = 1 ( it is minimum, because >0)

so, cant be maximum!

Answer 4

* there are

Answer 5

so it would be A right?

Answer 6

yes, you are right

Answer 7

ok thank you very much :)

Answer 8

wlcm :)