Your answer 1) A teacher asked the class to solve the equation 3(x + 2) = 21. Robert wrote 3x + 6 = 21 as his first step. Which property did he use? associative property
1) A teacher asked the class to solve the equation 3(x + 2) = 21. Robert wrote 3x + 6 = 21 as his first step. Which property did he use? associative property
The property used was Distributive property
so
3(x + 2) = 21
3x+3*2=21
3x+6=21
answer is
Distributive property
If we have
3(x+2)
applying distributive property means, that you multiply the number outside the parenthesis by each number inside the parenthesis
