The subtraction of unlike terms cannot be subtracted. For example, a  b will remain same as it is. Suppose the difference between two like terms is a single like term; but the two unlike terms cannot be subtracted to get a single term.
Subtraction of two positive unlike terms:
To find the difference of two positive unlike terms suppose, take n from m, we need to connect both the terms by using a subtraction sign and express the result in the form of m  n.
Therefore, the difference of two positive unlike terms m and n = m  n.
Subtraction of positive and negative unlike terms:
To find the difference of a positive and a negative unlike terms suppose, take n from m, we need to connect both the terms by using a subtraction sign [m  (n)] and express the result in the form of m + n.
Therefore, the difference of a positive and a negative unlike terms m and n = m + n.
Subtraction of negative and positive unlike terms:
To find the difference of a negative and a positive unlike terms suppose, take n from m, we need to connect both the terms by using a subtraction sign [(m)  n] and express the result in the form of m  n.
Therefore, the difference of a negative and a positive unlike terms m and n = m  n.
Subtraction of negative and negative unlike terms:
To find the difference of two negative unlike terms suppose, take n from m, we need to connect both the terms by using a subtraction sign [(m)  (n)] and express the result in the form of m + n.
Therefore, the difference of two negative unlike terms m and n = m + n.
For example:
1. The unlike
terms 2ab and 4bc cannot be subtracted to form a single term. All that
which can be done is to connect them by the sign of subtraction and
leave the result in the form 2ab  4bc.
2. 11x  7y 2x  3x.
= 11x  2x  3x  7y.
= 6x  7y (here 7y is an unlike term)
3. 3x  7y
Here 3x and 7y both are unlike terms so it will remain as it is.
Therefore, the answer is 3x  7y
4. 15x  12y  11x
= 15x  11x  12y
= 4x  12y (here 12y is an unlike term)
● Terms
Adding and Subtracting Like Terms
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