Im a freshmen in highschool, I dont know how to do some algebra equations like (5x-2) ( x2-x3 )-(2x2-3x-4) someone please help me!

Question

I know how to do some algebra equations but not all, i think this is a problem because im a freshmen in highschool and im not catching up in class

Answer 1

Hi John,

 

To solve this problem, first thing you'll want to do is multiply out the first set of parenthesis.  So, you want to multiply (5x-2) times (x²-x³).  This gives 5x³ - 5x⁴ - 2x² + 2x^{3 =} -5x⁴ + 7x³ - 2x² 

 

Now, take (-5x⁴ + 7x³ - 2x²) and subtract (2x² - 3x - 4).  This gives -5x⁴ + 7x³ - 2x² - 2x² + 3x + 4

 

Collecting like terms, we get -5x⁴ + 7x³ - 4x² + 3x + 4.