ANSWER

EXPLANATION
It was given that;

and

We want to find an expression for the composition function;


We substitute x² into f(x)=7x-9
This will give us:

The answer that was given to you is correct just to verify !
A: 8,250
B: 22
Step-by-step explanation:
A: 15 * 250 = 3,750 + 4,500 = 8,250
B: 10,000 - 4,500 = 5,500/250 = 22. 22 * 250 + 4,500 = 10,000
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