3 Answers

Sorry, it = 2x-12    I tried to solve it, you need to simplify, not the same! this must be what you want!

(5x-3)-(3x+9) the parenthesis are not required, 5x-3-3x+9, like terms 5x-3x=2x, like terms -3+9=6,

So answer is 2x+6.

Remeber if there was no sign between ()and() this would be a different deal as it would involve multiplying the polynomials.

(5x-3)-(3x+9)  remove parethesis, not related to problem

5x-3-3x+9 5x and 3x are like terms, so 5x-3x = 2x  and

 -3+9 = 6 are  like terms so,  2x+6 is the answer. Without a value for x this cannot, be further simplified. look between paranthesis! or you'll need FOIL First Out Inside Last  (5x-3)(-3x+9), = (5x * -3x + 5x * 9 - 3 * -3x - 3 *9)

Then solve all like terms to get ( -15x squared +54x - 27)