If we solve the equation$x = y^{2} + 10y$for y, we get the inverse of g. Completing the square:$y^{2} + 10y + 25 = x + 25$$y + 5 = \sqrt{x + 25}$$y = g^{-1}(x) = -5 + \sqrt{x + 25}$$g^{-1}(10) = -5 + \sqrt{35}\approx.916$