BOX METHOD FACTORING

About "Box method factoring"

Box method factoring :

Here we are going to see how to factor a quadratic equation using box method.

A equation which is in the form ax2 + bx + c known as quadratic equation.

Let us look into some example problems to understand the above concept.

Example 1 :

Factor 3x2 + 19x + 6 

Solution : 

Step 1 :

Draw a box, split it into four parts.

Write the first and last term in the first and last box respectively.

Step 2 :

Multiply the coefficient of x2 by the last term and find the factors of this number. The simplified values of those factors must be equal to the middle term.

Step 3 :

Factor horizontally and vertically

Factor x from the 1st row

Factor 6 from the 2nd row

Factor 3x from the 1st column

Factor 1 from the 2nd column

3x2 + 19x + 6 = (x + 6) (3x + 1)

Hence the factors of the given quadratic equation are (x + 6) and (3x + 1)

Example 2 :

Factor 5y2 - 29y + 20 

Solution : 

Step 1 :

Draw a box, split it into four parts.

Write the first and last term in the first and last box respectively.

Step 2 :

Multiply the coefficient of y2 by the last term and find the factors of this number. The simplified values of those factors must be equal to the middle term.

Since the middle term is negative, both factors will have negative sign.

Step 3 :

Factor horizontally and vertically

5y2 - 29y + 20  = (5y - 4) (y - 5)

Hence the factors of the given quadratic equation are (5y - 4) and (y - 5)

Example 3 :

Factor 2x2 + 17x  - 30

Solution : 

Step 1 :

Draw a box, split it into four parts.

Write the first and last term in the first and last box respectively.

Step 2 :

Multiply the coefficient of x2 by the last term and find the factors of this number. The simplified values of those factors must be equal to the middle term.

Since the last term is negative, the factors will be in the combination of positive and negative.

Step 3 :

Factor horizontally and vertically

2x2 + 17x  - 30  = (x + 10) (2x - 3)

Hence the factors of the given quadratic equation are (x + 10) and (2x - 3)

Example 4 :

Factor 18x2 - x  - 4

Solution : 

Step 1 :

Draw a box, split it into four parts.

Write the first and last term in the first and last box respectively.

Step 2 :

Multiply the coefficient of x2 by the last term and find the factors of this number. The simplified values of those factors must be equal to the middle term.

Since the middle and last term are negative, the factors will be in the combination of positive and negative.

Step 3 :

Factor horizontally and vertically

18x2 - x  - 4  = (2x - 1) (9x + 4)

Hence the factors of the given quadratic equation are (2x - 1) and (9x + 4)

After having gone through the stuff given above, we hope that the students would have understood "Box method factoring". 

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