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# Need help ASAP

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g(X) = -4x2 -3x + 2

determine G(-2)

Nov 15, 2019

#1
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hectictar can you help me again please??

Nov 15, 2019
#8
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awesome explanation hectictar! ! !

ok so here's the trick for these though:

remember just like hectictar said: "Replace every x with -2"

We know that we have a function: \(g(x) = -4x^2 -3x + 2 \)

and you also need to be very careful with PEMDAS

now! plug in -2 everywhere you see x

and solve!!

imagine a graph and i gave you the x coordinate (which you plugged in to your g(x) shhhh) and asked you to find the y coordinate

how would you locate the y coordinate given the x coordinate of your point? :)

but what if you were given \(f(x)=3x+5x-2+x^2\)
and told to find the \(f(-3)\)
can you tell me how that would work K19? :D

Nirvana  Nov 15, 2019
#2
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g(x)  =  -4x2 - 3x + 2

Replace every  x  with  -2

g(-2)  =  -4(-2)2 - 3(-2) + 2

Now what do you get if you calculate the right side of that equation?

Nov 15, 2019
#3
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i got

g(-2) = 16 - 6 + 2

is that right??

Nov 15, 2019
#4
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Very close!! But be careful with your negative signs!

g(-2)  =  -4(-2)2 - 3(-2) + 2

Negative two squared is equal to positive four.

g(-2)  =  -4(4) - 3(-2) + 2

Negative four times positive four equals negative sixteen.

g(-2)  =  -16  - 3(-2) + 2

Negative three times negative two equals positive six.

g(-2)  =  -16  +  6  +  2

Now just calculate negative sixteen plus six plus two!

Nov 15, 2019
#5
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i then got

g(-2) = -8

is that better lol

Nov 15, 2019
#6
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Perfect!! hectictar  Nov 15, 2019
#7
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sry to bug you but i will post another question in like a minute and this one i think i understand better i just need clarification

Nov 15, 2019