Question

5a^(2)+16a+3 step by step work shown

Answer 1

(5a + 1)*(a +3) = 5a^2 + 15a + a + 3 = original equation

Answer 2

to understand this problem, you need to practice more and recognize the problem at the first look
you have 5 (from 5a^2) and 16 (from 16a) and 3
to have 3 we need 1*3 = 3
that's why we have (x +1)*(y+3)
now to have 5a^2 we need 5a*a = 5a^2
that's why we have (5a+1)*(a+3)
the 16a will be automatically added up