Question

Find the maximum or minimum of the following quadratic function: y = -2x2 + 4x - 1

Answer 1

A. -1
B. 0
C. 1
D. 4

Answer 2

one of way, use the formula :
y_max = -(b^2 - 4ac)/(4a)
according the equation above, known : a=-2, b=4, and c=-1

it is maximum, because the value of coefficient of x^2 < 0

Answer 3

so its D

Answer 4

just guessing, right ?

Answer 5

no never mind its C i just did the problem and i got 1

Answer 6

y_max = -(b^2 - 4ac)/(4a) = -(4^2 - 4(-2)(-1))/(4*-2) = -8/-8 = 1
you are right

Answer 7

thank you :)

Answer 8

wlcm