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
MD
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Factorise and solve x^2 - 8x + 15 = 0.
The circle c has equation x^2 + y^2 = 1. The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.
Solve x^2 +11x +30 = 0