27. (2023•鹰潭一模)已知曲线f(x)=2x2+1f(x)=2x^{2}+1f(x)=2x2+1在点M(x0M(x_{0}M(x0,y0)y_{0})y0)处的瞬时变化率为−8-8−8,则点MMM的坐标为___(−2,9)(-2,9)(−2,9)___.