It is when all the sides are right angles.
hope it helped jwgwhwfhwgwjwh
First I'll make the assumption that you mean
4x+5
f(x) = ------------
x+4
and then set this function = to 25/9:
4x+5 25
f(x) = ------------ = ------
x+4 9
Solve for x: Cross-multiplying, we get 36x + 45 = 25x + 100.
Consolidating like terms, we get 11x = 55. Thus, x = 5.
