Question

simplify 2x{x+(x+2)[(x-1)(x+2)-3]+4}-(3x^2+2x-1)

Answer 1

Somebdy changed her photo!

Answer 2

One sec editing mistake

Answer 3

2x{x+(x+2)[(x-1)(x+2)-3]+4}-(3x^2+2x-1)
Okay...you have to take this one step at a time.
PEMDAS here we go.

I am going to look only at:
[(x-1)(x+2)-3] for a minute
(x^2 + x - 2) - 3 = x^2 + x - 5

now * (x+2)
(x+2)(x^2 + x - 5) = x^3 + 3x^2 - 3x - 10
now + x
x^3 + 3x^2 - 3x + x - 10 = x^3 + 3x^2 - 2x - 10
now + 4
x^3 + 3x^2 - 2x - 10 + 4 = x^3 + 3x^2 - 2x - 6

Now step back and look at the equation
2x{x+(x+2)[(x-1)(x+2)-3]+4}-(3x^2+2x-1)
everything inside the {} is dealt with
so multiply by 2x
2x(x^3 + 3x^2 - 2x - 6) = 2x^4 + 6x^3 - 4x^2 - 12x

Now let's look subtract!
2x^4 + 6x^3 - 4x^2 - 12x - (3x^2 + 2x - 1)
Make sure to watch your signs
2x^4 + 6x^3 - 4x^2 - 12x - 3x^2 - 2x + 1
2x^4 + 6x^3 – 7x^2 – 14x + 1

Answer 4

There we go

Answer 5

And yes :D, I changed my pix

Answer 6

@lizet5, does this make sense??

Answer 7

fibonacci style @ saifoo

Answer 8

:D

Answer 9

yes it does make sense i was just having trouble with the brackets i got most of the answer except for the -14x-1, your answer is the same as my instructor. I got your steps thank you very much

Answer 10

You are welcome. Sometimes it helps also to write it down with lots of space in between on scratch paper or color code stuff so that it is clear to yourself.

Answer 11

yeah i have to write on computer paper because the lines confuse me! but i will buy some color pencils that's a great idea. thanks again

Answer 12

No problem! Good luck