solve c(x)=x^2-40x+405 where x equals 15
just replace x with 15 and do the arithmetic.
c(15) = 15^2 - 40(15) + 405
= .....
To solve the equation c(x) = x^2 - 40x + 405 when x = 15, we can substitute the value of x into the equation and calculate the result.
First, let's substitute the value of x into the equation:
c(15) = 15^2 - 40(15) + 405
Now, we can simplify the calculation:
c(15) = 225 - 600 + 405
Next, we simplify further:
c(15) = 405 - 600 + 405
Now, we can combine like terms:
c(15) = -195 + 405
Finally, we calculate the result:
c(15) = 210
Therefore, when x = 15, c(x) is equal to 210.