# I'm having trouble solving this.

#### Jackie_Lopez123

##### New member
(3x^2 + 4x + 6+ + (-2x^2 + 5x - 9)

#### tkhunny

##### Moderator
Staff member
Small wonder. There is nothing to solve and it is quite confusing.

"+ +" -- Plus what?
"( ( )" -- Mismatched parentheses.

What were the instructions?

#### Jackie_Lopez123

##### New member
oops i meant (3x^2 +4x + 6) + (-2x^2 + 5x -9)

#### mmm4444bot

##### Super Moderator
Staff member
Jackie_Lopez123 said:
(3x^2 + 4x + 6) + (-2x^2 + 5x - 9)

I changed a plus sign to a parenthesis.
To simplify this expression, you could start by removing the parentheses, remembering that adding a negative term is the same as subtracting its opposite.

3x^2 + 4x + 6 - 2x^2 + 5x - 9

Next, group like-terms and do the arithmetic. Have you learned yet about like-terms?

In future requests for help, please explain what you're trying to do and why you're stuck (or show what you've tried so far). Thanks PS: The parentheses can be removed from this expression because the stuff inside is not being multiplied by anything.

#### Denis

##### Senior Member
Jackie_Lopez123 said:
oops i meant (3x^2 +4x + 6) + (-2x^2 + 5x -9)
What do you mean by "solving this"?
Set the results = 0, then solve for x?

Can you solve this for x: x^2 + x - 2 = 0 ?

#### mmm4444bot

##### Super Moderator
Staff member

It's been awhile, since we asked you about combining like-terms. Maybe you figured out the following by now.

To simplify the given expression, remove the parentheses

3x^2 + 4x + 6 - 2x^2 + 5x - 9

Associate like-terms

(3x^2 - 2x^2) + (4x + 5x) + (6 - 9)

Factor out coefficients, if you want to

(3 - 2)x^2 + (4 + 5)x + (6 - 9)

Do the arithmetic

x^2 + 9x - 3