Let $a\star b = \frac{\sqrt{a+b}}{a}$. If $ x \star 24 = 7$, find $x$.
√(x + 24) / x = 7
√(x + 24) = 7x
square both sides
x + 24 = 49x^2
49x^2 - x - 24 = 0
x = (1 + √(1^2 + 4*24*49)) / 2*49
