Question

I am keeping getting wrong answer and I don’t know why?

Answer 1

A.3a'2-2a+1

Explanation:

substitute a+1 for X so

3a'2 +3-2a-2

reorder and simplify

3a'2-2a+1

Answer 2

`\bf f(x)=3x^2-2x\qquad \qquad f(a+1)=3(a+1)^2-2(a+1) \\\\\\ f(a+1)=3(a^2+2a+1)-2a-2\implies f(a+1)=3a^2+6a+3-2a-2 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill f(a+1)=3a^2+4a+1~\hfill`