Question

The maximum and minimum value of
y= 2 x3 – 6x2 - 18x + 7
is
A
17,-47
B
47,-17
C
17,47
D
-47, 17​

Answer 1

Answer:

x² + 6x - 12

y’ = 2x + 6

the minimum will be when y’ = 0

so

0 = 2x + 6

2x = -6

x = -3

y = (-3)² + 6(-3) -12

y = 9 - 18 - 12

y = -21