Answer: 40?
Step-by-step explanation: I don't quite understand your question fully
We have 4(x^2 - 2x + 4) - 7 = 4x^2 - 8x + 16 - 7 = 4x^2 - 8x + 9;
So, 4x^2 - 8x + 9 = <span>ax^2+bx+c
;
The value of b is -8.</span>
The answer is 4 and four-fifths.
I honestly don't know because i'm only in sixth grade but I think that it might be 30*.