Evaluate the expression below when x = -1

2x^2 - 5 over x+9

A) -7/8
B) -3/8
C) -1/8
D) -1

Question

Evaluate the expression below when x = -1

2x^2 - 5 over x+9

A) -7/8
B) -3/8
C) -1/8
D) -1

anonymous · Answer

I tried, can you please tell me the answer.. I'm not good at math

phi · Answer

First, what exactly is the question?
is it
(2x^2 - 5)/ (x+9)
?
i.e. is it
$$ \frac{ 2x^2 - 5}{ x+9} $$

anonymous · Answer

The second one @phi I just never understood how to write

phi · Answer

if you don't use the math equation editor (button on the lower left of where you type in)
then you should put in parens  (like I did up above the "nice" version)
otherwise it means what Akash posted (which is different)

phi · Answer

to answer your question,  look for the x's in the expression.
*erase them* and put in -1 instead.
can you do that ?

anonymous · Answer

study that

anonymous · Answer

@phi Can you tell me the answer. I'm sick and have a bad headache but I got to get this done :( Sorry for being so blunt

anonymous · Answer

@iGreen can you help me

phi · Answer

look for the x's in the expression. *erase them* and put in -1 instead. can you do that ?

igreen · Answer

$\dfrac{ 2x^2 - 5}{ x+9}$

Input -1 for all values of x:

$\dfrac{ 2(-1)^2 - 5}{ -1+9}$

Simplify Exponent:

$\dfrac{ 2(1) - 5}{ -1+9}$

Multiply:

$\dfrac{ 2 - 5}{ -1+9}$

Add & Subtract:

$-\dfrac{3}{8}$

anonymous · Answer

Your a life saver c:

igreen · Answer

Lol, np.