Function Mapping Diagrams

[Guest]

Could someone please show me how to solve this problem?

[Guest]

Here are 2 equations

[tex]-4 = a*(-1)^2 + b*(-1)[/tex]

[tex]8 = a*1^2 + b*1[/tex]

You can write 3 ones just replace x with -1, 1, 2 and f(x) with the corresponding value i.e.: -4, 8, 20