The formula of the expression -3a + 6b= a + 4b in terms of a will be f(a) = 2a.
Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.
The given expression will be solved as below:-
-3a + 6b= a + 4b
-3a -a = -6b + 4b
-4a = -2b
b = 2a
f(a) = 2a
Therefore, the formula of the expression -3a + 6b= a + 4b in terms of a will be f(a) = 2a.
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