The answer is 3x² - 6x + 14.
Steps:
For polynomial addition and subtraction, you want to add the like terms. Each term is separated by whether or not it has a variable (x), and the value of its exponent.
First, we get rid of the parentheses.
3x² - 2x + 5 - 4x + 9
An easy way to see what can be combined is to group the terms by rearranging the expression (Parentheses included are optional).
(3x²) + ( - 2x - 4x) + (5 + 9)
From here, do the problem as normal.
(3x²) = 3x²
(- 2x - 4x) = - 6x
(5 + 9) = 14
Then recombine the terms you’ve got to form the simplified expression.
= 3x² - 6x + 14
or
= 3x² + (- 6x) + 14
First time answering, hope this helped!