f(b)-f(a)/b-a, a=2, a=4, is their another way I'm supposed to be putting this in than just simply putting in the a and b values

given: -2x^2-5x+4

Question

f(b)-f(a)/b-a, a=2, a=4, is their another way I'm supposed to be putting this in than just simply putting in the a and b values

given: -2x^2-5x+4

freckles · Answer

I bet b is equal to one of those values

freckles · Answer

also to find f(4) or f(2) 
you need to use the function given

anonymous · Answer

So would the top line be -48-(-14) for f(b)-f(a)?

anonymous · Answer

Do you mean
$\frac{ f(b)-f(a) }{ b-a }$,  where $ a = 2, b =4 $
and where 
$$f(x)=-2x^2-5x+4$$

f(2) = -14
f(b) = -38
a - b = -2
so
$$\frac{ f(4)-f(2) }{ 4-2 }= \frac{ -38 +14 }{ 2 } = -12$$

anonymous · Answer

but i was wrong
you are right

anonymous · Answer

i don't think that is right

freckles · Answer

-48 is right

freckles · Answer

for f(4)

anonymous · Answer

yeah, my arithmetic is not good

freckles · Answer

i just wanted to say that because 2 people have already said it was something different :p

anonymous · Answer

so f(b) is -48 
     f(a) is -14

anonymous · Answer

yes sorry my arithmetic is louzy too

anonymous · Answer

especially since you need to be quick, otherwise someone else is jotting in anwers