intevsive math. 9th grade.

3(2x+1) for x= -8

Question

intevsive math. 9th grade.

3(2x+1)  for  x= -8

amistre64 · Answer

oh thats college algebra too

anonymous · Answer

in the USA

amistre64 · Answer

and parts of venezuela maybe

anonymous · Answer

yea its supposed to CPM (collage prep i think)

anonymous · Answer

just sub the -8 in for x in the expression and evaluate

riley · Answer

Plug in -8 where you see x.

3(2(-8)+1)

Then you work through it and solve everything out.

2 * -8 = -16

So your left with:    3(-16+1)

-16+1 = -15

3(-15) = -45

So your answer is -45!

anonymous · Answer

okay so, ... 3(2x8+1)   
now what? I dont know what to do

amistre64 · Answer

3(2x+1)  for  x= -8

3(2x+1) = N

2x+1 = N/3

x+1/2 = N/6

x= N/6 - 1/2 

x= (N-3)/6  ; when x=-8, N-3 = -48

N = -45

anonymous · Answer

Thank you all for helping me!!!

amistre64 · Answer

dios de machina lol

riley · Answer

Just make sure you always work the math out in the correct order of operations.  PEMDAS = Please excuse my dear aunt sally.  It's a funny saying to help you remember the order of operations.  It stands for:

"Parentheses, Exponents, Multiplication, Division, Addition, Subtraction"

amistre64 · Answer

lol ... order of ops

anonymous · Answer

sub in the -8 for x$$3(2(-8)+1)$$simplify the mult inside the parens first$$=3(-16+1)$$continue to simplify inside the parens$$=3(-15)$$then multiply the 3$$=-45$$

anonymous · Answer

riley's post is VERY useful to know

anonymous · Answer

yea agreed. (:

anonymous · Answer

$$x-6 \over 4  - 1$$

amistre64 · Answer

order of op it; and remember to divide before you add ro subtract ;)

anonymous · Answer

yea how do you apply that?