please help me I’ll mark you brainliest

Answer:
A=1, B=45, C=-81
Step-by-step explanation:
We first have to start off by multiplying the entire equation by 9. This is to get an independent x^2. By doing this we are left with x^2+45x-81. After reaching this point we have out A, B, and our C as 1, 45, and -81.