Parabola of the form y=x²: Complete the missing numbers

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=16$

$f(4)$$f(-4)$

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=25$

$f(5)$

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=9$

Answer A+C

Calculate the value of $a$.

$f(x)=x^2$$$

$f(4)=6+a$

$a=10$

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=49$

Answers a + b

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=64$

$f(8)$$f(-8)$

Complete:

The missing value of the function point:

$f(x)=x^2$

$f(?)=81$

$f(-9)$

Complete:

the value $a$ The subtraction of the function point:

$f(x)=x^2$

$f(6)=6+a$

$a=30$