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3. Subtraction (17x)-(20x) = -3x The form 17x-15x can also be written as the addition of
two algebraic forms (17x)-(15x)
Example 2.1 Addition of algebraic forms
Find the sum of 7a + 4b with 8a-6b.
Solution:
(7a + 4b) + (8a 6b) = 7a + 4b + 8a + (–6b) spread out
= 7a + 8a + 4b + (–6b) collect similar tribes
= 15a + (−2b) operate like tribe
= 15a-2b simplify
Example 2.1 Subtraction of algebraic
forms
Find the subtraction of 7a + 4b by 8a-6b.
Solution:
(7a + 4b)-(8a 6b) = 7a + 4b – 8a (−6b) spread out
= 7a 8a + 4b + 6b collect similar tribes
= a + 10b operate like tribe
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