Answer:
See below in bold.
Step-by-step explanation:
Factored form:
f(x) = -5(x + 7)(x - 9)
Standard form:
f(x) = -5(x^2 + 7x - 9x - 63)
f(x) = -5(x^2 - 2x - 63)
f(x) = -5x^2 + 10x + 315.
We subtract 36-9 which equals 27
Answer:B=66.62 .... hope that helps :)