Expand the bracketed terms on the left hand side to get
7x^2 + (7a+b)x + ab
For this to equal the right hand side we must have.
ab = 6 And 7a+b = c
As a and b are positive integers we have the following possibilities:
a = 1. b = 6
a = 6. b = 1
a = 2. b = 3
a = 3. b = 2
Choose one of these combinations to work out one possible value for c using c = 7a+b
Expand the bracketed terms on the left hand side to get
7x^2 + (7a+b)x + ab
For this to equal the right hand side we must have.
ab = 6 And 7a+b = c
As a and b are positive integers we have the following possibilities:
a = 1. b = 6
a = 6. b = 1
a = 2. b = 3
a = 3. b = 2
Choose one of these combinations to work out one possible value for c using c = 7a+b