y = 4x^2 + 20x + 11 is a curve. Find the minimum point of the curve.
Differentiate equation = 8x+ 20Set differential to 0 and calculate xx = 2.5
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Aled has three concrete slabs. Two of the slabs are square, with each side of length x metres. The third slab is rectangular and measures 1 metre by (x +1) metres. The three concrete slabs cover an area of 7m^2. Show that 2x^2 + x – 6 = 0. Find x.
Solve 5x^2 = 10x + 4 Give your answers to 2 decimal places. [4 marks]