snakeyesxlaw
New member
- Joined
- Sep 8, 2007
- Messages
- 43
Problem#1: Let f(x)= (14 x + 19) / (x - 15)
Then f^(-1)(x) = (Ax + B) / (Cx + D)
where A, B, C, D are integers with A positive and the fraction cannot be reduced.
okay so basically, i started this:
x(y - 15) = 14y + 19
xy - 15y = 14y + 19
xy = 14y + 19 + 15y
xy = 29y + 19
x = (29y + 19) / y
what next? any suggestions?
Problem #2: The product of a number and the square of another number is 62.5. If x is the number that is squared, write the sum S of the two numbers as a function of the number x.
S(x) =
okay, so far:
y(x^2) = 62.5
Then f^(-1)(x) = (Ax + B) / (Cx + D)
where A, B, C, D are integers with A positive and the fraction cannot be reduced.
okay so basically, i started this:
x(y - 15) = 14y + 19
xy - 15y = 14y + 19
xy = 14y + 19 + 15y
xy = 29y + 19
x = (29y + 19) / y
what next? any suggestions?
Problem #2: The product of a number and the square of another number is 62.5. If x is the number that is squared, write the sum S of the two numbers as a function of the number x.
S(x) =
okay, so far:
y(x^2) = 62.5