# Simplify

• Mar 5th 2006, 12:33 PM
batman123
Simplify
If (gx) = 2x^2 -3x, evaluate, expand and simplify completely.

g(-2)

g(-c)

g(d^2)

g(-2)
• Mar 5th 2006, 01:50 PM
Jameson
Quote:

Originally Posted by batman123
If (gx) = 2^2 -3x, evaluate, expand and simplify completely.
g(-2)
g(-c)
g(d^2)
g(-2)

I hope you mean g(x)=2^2-3x or g(x)=4-3x

g(-2) is just plugging in -2 for x. So we get g(-2)=4-3(-2)=16

g(-c) is the same thing. Plug in -c for x, and see what you get.
• Mar 5th 2006, 08:29 PM
earboth
Quote:

Originally Posted by batman123
If (gx) = 2x^2 -3x, evaluate, expand and simplify completely.
g(-2)
g(-c)
g(d^2)
g(-2)

Hello,

first: The last problem is the same as the first problem, so I'll not do that again.

second: Plug in the given value for x and calculate:

$g(-2)=2 \cdot (-2)^2-3 \cdot (-2)=2 \cdot (4)+6=14$
$g(-c)=2 \cdot (-c)^2-3 \cdot (-c)=2 \cdot c^2+3c$
$g(d^2)=2 \cdot (d^2)^2-3 \cdot (d^2)=2 \cdot (d^4)-3d^2$

Greetings

EB