Which technique is best to use for x² + 4x = 15

U want to go x2 plus x so its x3 then 4x3times -15 so x=3.33333

the answer is c)8

step-by-step explanaction:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads