Simplify the following expression by combining like terms:
$5x^2+6x−3+4x^2−8x+2$.

1. A term is a single number, variable, or product of numbers and variables. How many terms are in the original expression? How many are in the simplified expression?

   Hint (a):

   $5b-2+3b+4$

   group like terms: $(5b+3b)+(-2+4)$

   simplify: $8b+2$

2. When variable(s) are multiplied by a number, the number is called a coefficient. What is the coefficient of $x$ in your simplified expression?