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4a + 4b is one possible answer.
(b + 4)(b + 4)
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4
(b+h)(b+h)= b2+2hb+h2.
You must have seen expressions such as 3:4::12:16, which reads 3 is to 4 as 12 is to 16. Sometimes encountered as 5:a::30:b, which is read 5 is to a as 30 is to b. Is this the type of ratio to which you refer.