Question

Simplify: 3x2 - 4x - 5x2 + 8x

Answer 1

-2x^2+4x I hope this helps!

Answer 2

For this question, all you have to do is combine like terms.  I am assuming that the 3x2 and 5x2 are exponents, so they are one pair and then -4x and 8x are the other.  The rule is the higher exponent goes first, so here is what it looks like:

3x2 - 4x - 5x2 +8x

First combine the numbers with exponents, 3x2-5x2, you always bring over the positive or negative, which ever it may be, in this case, since it is -5x2, you bring that over.

3x2-5x2=-2x2

Now to do the number with matching letters, -4x+8x= 4x

Now just bring the problem back together:

-2x2+4x

That is your simplified answer: -2x2+4x.