(vi) Maximum point (−12,254)\boxed{\text{Maximum point }\left(-\frac{1}{2},\frac{25}{4}\right)}Maximum point (−21,425) Domain R, Range (−∞,254]\boxed{\text{Domain }\mathbb{R},\;\text{Range }\left(-\infty,\frac{25}{4}\right]}Domain R,Range (−∞,425]