Question

Can someone please help with these other 2

Answer 1

Part b:

$f(a+3)=(a+3)^2+4$

Solve for (a+3)^2

$= (a^2+2(3)(a)+3^2)+4$

$= a^2+6a+13$

Part c:

$f(d+b)=(d+b)^2+4$

Solve for (d+b)^2

$= (d^2+2db+b^2)+4$

$= d^2+2db+b^2+4$

Let me know if you need any clarifications, thanks!