Starting with x0=2x_0 = 2x0=2, use the iteration formula xn+1=5xn2+1\displaystyle x_{n+1} = \frac{5}{x_n^2 + 1}xn+1=xn2+15 three times to find an estimate for the solution to x3+x=5x^3 + x = 5x3+x=5.
