Question

Determine whether the following has a maximum or minimum value and then compute that value:
y = 2x2 + 10x - 4

Answer 1

is that 2 times 2 or no

Answer 2

do you have any answer choices

Answer 3

yeah but i found it i need help with this one
Determine the quadratic equation for the parabola:
range: {y:y ≤ 9}; x-intercepts: -2 and 4

Answer 4

have you already tackled derivatives?

Answer 5

no im taking online classes so some of the stuff i dont know

Answer 6

lol same here wait a few ill get you an answer

Answer 7

ah ok

Answer 8

thankyouuuu

Answer 9

ok here's a review. to find the maximum and minimums of the value of a function, what we commonly do is we first find the critical points

Answer 10

now what are critical points? these are points where the derivative of the function of f'(x)=0

Answer 11

so suppose if we have any constant c and I plug this in to f'(x) and get 0 or if f'(c)=0 then the function will have a critical point at x=c

Answer 12

wow im stumped lol heressometimes try to put you question in google or yahoo to get a

Answer 13

fasster answer

Answer 14

now this critical point could either be a minimum point or a maximum point

Answer 15

k cuase this seems to complicated

Answer 16

ok ok :)) I'll make it simplier then

Answer 17

lol when everyone confuses me i just look on google and yahoo for the answer lol

Answer 18

first find f'(x)

Answer 19

here we have f'(x)=4x+10

Answer 20

yeah they got this site called expert.com and it has alot of answers you just type in the proplem

Answer 21

haha that even confuses me hey anony try my question lol

Answer 22

If you know the x intercepts of the "equation" you can reason towards the form asked for.

Answer 23

ok ok :))

Answer 24

For example, you know that x=-2 will make f(x)=0, that is f(-2)=0

Answer 25

btw it has a minimum which is at point x=-5/2

Answer 26

Moreover, you know that x=4 will make the function attain a 0value. f(4)=0

Answer 27

This leads to the equation: (x-4)*(x+2), the 2 factors are the "roots" of the equation - where the value of the function is 0.

Answer 28

Which results in x^2+2x-4x-8 --> f(x)=y=x^2-2x-8