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a * b = 2a - 3b + ab, then 3*5 + 5*3 = ?

Question 1:

a * b = 2a - 3b + ab, then 3*5 + 5*3 = ?

A. 20

B. 21

C. 22

Feedback = 2(3)-3(5)+(3*5) + 2(5)-3(3)+(5*3)
= 6-15+15+10-9+15 = 31-9 = 22

D. 23

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Practice Simplification Online Test 5 | Englishfreetest.com

20 minutes
10 questions