Question

If f(x) = x2 - 3x + 1 and f(2 a) = 2f(a) then a is equal to​

Answer 1

For these question, it has two separate equations: 2f(a) and f(2a) .

For f(2a) equations its x=2a, so you must substitute 2a into the f(x) equation

For 2f(a), it means the two time of f(a) equation with x=a, so you substitute a inti f(x) equation first, then you multiply it by 2.