x = \frac{20}{4} = 5, \quad x = \frac{12}{4} = 3
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- b^2 - 4ac = (-16)^2 - 4 \times 2 \times 30 = 256 - 240 = 16
- Roots:
- x = \frac{16 \pm \sqrt{16}}{4} = \frac{16 \pm 4}{4}
- #### #### 3, 5
- A rectangular plot of land has a length that is twice its width. If the perimeter is 180 meters, find the area of the plot.
- Perimeter: \(2(w + 2w) = 180 \Rightarrow 6w = 180 \Rightarrow w = 30\).
