Question

Select all the equations that are true
18x - 6 = 6(3x-1)
12m - 21 = 3(4m -7)
-3x -1 = -1(3x+1)
14a + 21b = 7(2a+ 21b)
-5x - 15y - 20 = -5(x+3y+4)

Answer 1

eq 1 2 3 and 5 are correct

Step-by-step explanation:

6(3x-1) = 6*3x - 6*1 = 18x-6

3(4m-7) = 3*4m - 3*7 = 12m-21

-1(3x+1) = -1*3x + -1*1 = -3x-1

7(2a+21b) = 7*2a + 7*21b = 14a+147b

-5(x+3y+4) = -5*x + -5*3y + -5*4 = -5x -15y-20