Question

Which expression is equivalent to 6a + 15?

A. 6(a + 5)
B. 3(2a + 5)
C. 3(3a + 12)
D. 6(a + 12)
PLEASE HELP :)

Answer 1

with choice A, we can distribute to get

6(a + 5) = 6*a + 6*5 = 6a + 30

the result we get above is NOT the same as 6a+15, so choice A is out

Answer 2

do the same for the other choices

Answer 3

how do i do it ?

Answer 4

notice how I multiplied the outer 6 by each term inside the parenthesis

6 times a = 6a
6 times 5 = 30

so that's why 6(a+5) = 6a+30

making sense?

Answer 5

6a+15=3*2a+3*5=3(2a+5)