Help factorise these expressions as far as possible

I'll have to write squared as SQRD because i can't do the little 2
6aSQRD-5ab=


14pqrs+49qSQRDrs-35qrs=

If you could explain how you did it, it would be a big help.

6aSQRD-5ab this can be written as 6a^2 - 5ab

= 6 * a * a - 5 * a * b

= a * (6a - 5b) or a(6a - 5b)


14pqrs+49qSQRDrs-35qrs can be written as 14pqrs + 49rsq^2 - 35qrs

= 14 * p * q * r * s + 49 * q * q * r * s - 35 * q * r * s

= 7 * q * r * s * (2 * p + 7 * q - 5)

= 7qrs(2p + 7q - 5)