book Maths Puzzle Numerical Ability

8x+13x-4=0

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I have an equilateral triangle with an area of 30 square centimeters. I need to find the base and height of the triangle. ok I need to graph and get the intercepts for the problem y = -4x^2 +16x - 12 I know its a downward cone shape but I cannot get the vertex or the intercepts right.