Question

Which property is not used to simplify the following expression?

2 . (x + 5) + 7x = (2x + 10) + 7x
= (10 + 2x) + 7x
= 10 + (2x + 7x)
= 10 + 9x
= 9x + 10
a. commutative property of addition
b. associative property of addition
c. commutative property of multiplication
d. distributive property ​

Answer 1

c

Explanation:

we did not use the commutative property of multiplication because it states that (a*b)*c is the same as a*(b*c). but there was no part that used this property