# Thread: simplify!

1. ## simplify!

please simplify
(1.2x^3+4.5x^2-3.8x)+(-3.4x^3-4.7x^2+23)

2. ## Re: simplify!

The . indicate decimal points I assume?

If so simply group and add like terms $1.2x^3+-3.4x^3 = -2.2x^3$ do the same for different orders of $x$

3. ## Re: simplify!

What about this one.....
-4x(2x^3-6x^2-5x+1)

4. ## Re: simplify!

Originally Posted by Pandatwirler2
What about this one.....
-4x(2x^3-6x^2-5x+1)
2x^3-6x^2-5x+1 isn't factorable.

5. ## Re: simplify!

Originally Posted by Pandatwirler2
What about this one.....
-4x(2x^3-6x^2-5x+1)
You can expand the $-4x$ into the bracket here,

$-4x(2x^3-6x^2-5x+1) = -4x\times 2x^3-4x\times-6x^2-4x\times-5x-4x\times 1 = \dots$

Is that what you are after?

6. ## Re: simplify!

yes but how do you multiply -4x with 2x^3?

7. ## Re: simplify!

you multiply the coefficients and add the exponents

$(-4x)(2x^3) = -8x^4$

8. ## Re: simplify!

Originally Posted by Pandatwirler2
yes but how do you multiply -4x with 2x^3?
Has you teacher not told you how?