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Introduction to Algebraic Expressions

Add:iii −3𝑎+...

Question

Add:
(iii) −3𝑎+2𝑏 and 3𝑎+𝑏

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Solution

Step: Find the value of −3𝑎 + 2𝑏 + 3𝑎 + 𝑏
We need to add (−3𝑎+2𝑏) and (3𝑎+𝑏)
= (−3𝑎+2𝑏)+ (3𝑎+𝑏)
= −3𝑎+3𝑎+2𝑏+𝑏
= (−3+3)𝑎+(2+1)𝑏
= 3𝑏
Hence, the answer is 3𝑏.

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