book Maths Puzzle Numerical Ability

4(2x+7)=108

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book Other Question

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. What is the smallest value assumed by the polynomial p(x) = 4x^2 - 3x + 8?