Factorize the Trinomial x Square Plus px Plus q


Factorize the trinomial x square plus px plus q means x2 + px +q.

In order to factorize the expression x2 + px + q, we find two numbers a and b such that (a + b) = p and ab = q.

Then, x2 + px + q = x2 + (a + b)x + ab

                         = x2 + ax + bx + ab

                         = x(x + a) + b(x + a)

                         = (x + a)(x + b) which are the required factors.


Solved examples to factorize the trinomial x square plus px plus q (x^2 + px + q):

1. Resolve into factors:

(i) x2 + 3x - 28

Solution:

The given expression is x2 + 3x - 28.

Find two numbers whose sum = 3 and product = - 28.

Clearly, the numbers are 7 and -4.

Therefore, x2 + 3x - 28 = x2 + 7x - 4x - 28

                                = x(x + 7) - 4(x + 7). 

                                = (x + 7)(x - 4).

(ii) x2 + 8x + 15

Solution:

The given expression is x2 + 8x + 15.

Find two numbers whose sum = 8 and product = 15.

Clearly, the numbers are 5 and 3.

Therefore, x2 + 8x + 15 = x2 + 5x + 3x + 15

                                = x(x + 5) + 3(x + 5). 

                                = (x + 5)(x + 3). 


2. Factorize the trinomial:

(i) x2 + 15x + 56

Solution:

The given expression is x2 + 15x + 56.

Find two numbers whose sum = 15 and product = 56.

Clearly, such numbers are 8 and 7.

Therefore, x2 + 15x + 56 = x2 + 8x + 7x + 56

                                  = x(x + 8) + 7(x + 8) 

                                  = (x + 8)(x + 7).

(ii) x2 + x - 56

Solution:

The given expression is x2 + x - 56.

Find two numbers whose sum = 1 and product = - 56.

Clearly, such numbers are 8 and - 7.

Therefore, x2 + x - 56 = x2 + 8x - 7x - 56

                              = x(x + 8) - 7(x + 8)

                              = (x + 8)(x - 7).





8th Grade Math Practice

From Factorize the Trinomial x Square Plus px Plus q to HOME PAGE




Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?

Recent Articles

RSS

  1. Worksheet on Yesterday, Today and Tomorrow | Sequence of the Week-days

    Nov 25, 24 01:18 AM

    Practice the worksheet on yesterday, today and tomorrow, the questions are based on the sequence of the week-days, their names and order. We know, the present day is today, the day before today

    Read More

  2. Yesterday, Today and Tomorrow | Name of each Day of the Week

    Nov 25, 24 01:09 AM

    We will learn the relation between yesterday, today and tomorrow. There are seven days in a week. We know the name of each day of the week. Sunday is known as the first day of the week.

    Read More

  3. The Story about Seasons | Spring | Summer | Autumn | Winter

    Nov 25, 24 12:48 AM

    The Four Seasons
    Kids let’s enjoy the story about seasons. Here we will discuss about the four seasons and the duration. Some months are too hot and some are too cold. The period of hot months is called the hot

    Read More

  4. Months of the Year | List of 12 Months of the Year |Jan, Feb, Mar, Apr

    Nov 25, 24 12:17 AM

    Months of the Year
    There are 12 months in a year. The months are January, February, march, April, May, June, July, August, September, October, November and December. The year begins with the January month. December is t…

    Read More

  5. Time Duration |How to Calculate the Time Duration (in Hours & Minutes)

    Nov 24, 24 11:01 PM

    Time Duration Example
    Time duration tells us how long it takes for an activity to complete. We will learn how to calculate the time duration in minutes and in hours. Time Duration (in minutes) Ron and Clara play badminton…

    Read More