Question

What are the solutions of x^2 − 3x − 18 = 0?
x = 3, x = −6
x = −3, x = 6
x = 3, x = 6
x = −3, x = −6

Answer 1

What did you get from factoring?

Answer 2

Well, I haven't tried that...

Answer 3

In order to solve this, that will need to be your first step.

Answer 4

Okay.

Answer 5

The start will be (x )(x ).

Answer 6

Now, I have to find factors of -18 that add to -3.

Answer 7

Good, you are well on your way to solving this.

Answer 8

Thanks.

Answer 9

Okay, 3 plus -6. That makes -3.

Answer 10

(x + 3)(x - 6)

Answer 11

Now set each of those equal to 0 and solve for 'x' to get your solution.

Answer 12

x could equal -3

Answer 13

and also 6.

Answer 14

That way, either way, it would equal 0.

Answer 15

Thank you.

Answer 16

You are welcome. Good job.