Question

we two terms which are like
(ii) 4mn2
2.5 Addition and Subtraction of Algebraic Expressions
in the earlier classes, we have also learnt how to add and subtract algebraic expressions.
For example, to add 7x2 - 4x + 5 and 9x - 10, we do
Observe how we do the addition. We write each expression to be added in a separate
Tow. While doing so we write like terms one below the other, and add them, as shown
Thus 5+(-10) = 5-10=-5. Similarly, - 4x + 9x=(-4+9)x = 5x. Let us take son
Sample 1: Add: 7xy + 5yz - 3zx, 4yz +9zx - 4y, -3x2 + 5x - 2xy.
(ii) 21
7x² - 4x + 5
+
9x – 10
7x2 + 5x – 5
Writing the three expressions in separate rows, with like terms one be
are examples​

Answer 1

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Answer 2

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