Example 9: Multiply
(i) (a + 7) and (b - 5)
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Answer:
ab-5a+7b-35
Step-by-step explanation:
(a+7)*(b-5)
=a(b-5)+7(b-5)
=(a*b)-(a*5)+(7*b)-(7*5)
= ab-5a+7b-35
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