Factor -92x² - 75x

Factor -92x² - 75x - 13

Here we will show you how to factor the quadratic function -92x² - 75x - 13 using the box method. In other words, we will show you how to factor negative 92x squared minus 75x minus 13 (-92x^2 - 75x - 13) using the box method. It is a 5-step process:

Step 1: The standard form of a quadratic equation is ax² + bx + c. In this equation, a is negative. Therefore, we need to start by setting aside the negative (-). We do this by flipping the signs in the equation to get 92x² + 75x + 13. Now we can label the different parts of our equation, like this:

a = 92
b = 75
c = 13

Step 2: Next, we need to draw a box and divide it into four squares:

1	23x	13
4x	92x²	52x
	23x	13

We put 92x² (a) in the bottom left square and 13 (c) in the top right square, like this:

1	23x	13
4x	92x²	52x
	23x	13

Step 3: In order to fill in the other two squares, we need to do some math. We have to find two numbers that multiply together to give us the product of 92 times 13 (a × c), and add together to equal 75 (b).

More specifically, 92 times 13 is 1196. Therefore, we need to find the two numbers that multiply to equal 1196, and add to equal 75.

? × ? = 1196
? + ? = 75

After looking at this problem, we can see that the two numbers that multiply together to equal 1196, and add together to equal 75, are 23 and 52, as illustrated here:

23 × 52 = 1196
23 + 52 = 75

Now, we can fill in the last two squares in our box with 23x and 52x. Place 23x in the upper left square, and place 52x in the lower right square.

1	23x	13
4x	92x²	52x
	23x	13

Step 4: Next, we need to find four final numbers to finish factoring our equation. We can see that our box is a 2 x 2 table made up of rows and columns.

Our goal is to find the numbers that, when multiplied together, result in the products in each square. We can do this by finding the greatest common factor in each row.

Let’s look at the top row. We have the terms 23x and 13. The greatest common factor of 23x and 13 is 1. Therefore, we write 1 to the left of the top row. You can see it here in the color green:

1	23x	13
4x	92x²	52x
	23x	13

Next, let’s look at the bottom row. We have the terms 92x² and 52x. The greatest common factor of 92x² and 52x is 4x. Therefore, we write 4x to the left of the bottom row. You can see it here in the color blue:

1	23x	13
4x	92x²	52x
	23x	13

To find the values below the table, we first divide 92x² by 4x (labeled in blue). This gives us 23x.

92x² ÷ 4x = 23x

You can see this value colored in orange below:

1	23x	13
4x	92x²	52x
	23x	13

Next, we divide 52x by 4x (labeled in blue). This gives us 13.

52x ÷ 4x = 13

You can see this value colored in purple below:

1	23x	13
4x	92x²	52x
	23x	13

Step 5: Now we have all of the information we need to finish factoring the equation. The values outside of the box are used to factor -92x² - 75x - 13. You simply put the values on the left in one set of parentheses, and the values below in another set of parentheses, to get:

(4x + 1)(23x + 13)

In our original quadratic equation, -92x² - 75x - 13, a is negative. Therefore, we need to add a negative (-) sign before our two sets of parentheses, like this:

-(4x + 1)(23x + 13)

That’s it! Now you know how to factor the equation -92x² - 75x - 13.

Factoring Quadratics
Go here if you want to learn how to factor another quadratic function.

Factor -92x² - 75x + 17
Here is the next quadratic function on our list that we have factored for you.