If there is a plus, '+' sign before the brackets, then the signs of terms within
brackets remain unchanged after removing the brackets.
If there is a minus, '-' sign before the brackets, then the signs of terms within
brackets change, after removing the brackets.
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If plus, '+' sign is to be there
before the brackets to be inserted,
then the terms within the brackets
need be written without any change
in their signs.
If minus, '-' sign is to be there
before the brackets to be inserted,
then the terms within the brackets
need be written after changing
their signs.
Let us see two Examples
one on Removal and
one on Insertion of brackets.
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Write the first two terms and last two terms of the expression -2x + 3y + 4z + 5l - 6m within brackets keeping (i) plus, '+' sign and (ii) minus '-' sign before the brackets.
Solution to Example 2 of Algebra Rules: (i) -2x + 3y + 4z + 5l - 6m = +(-2x + 3y) + 4z +(5l - 6m) Ans. (ii) -2x + 3y + 4z + 5l - 6m = -(2x - 3y) + 4z -(-5l + 6m) Ans.
If you want to learn about
introduction of equations
and the associated terminology
different types of Equations
and their solutions
and the word Problems on Equations,
Go to
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