exam Maths Puzzle Numerical Ability

Hi. I'm having some trouble finding the vertex of this function. Can you help me?

y = 8x^2 + 5x

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exam Other Question

The sum of the measures of the angles of a regular polygon is 5040. Find the measure of each angle. how will you factor 2x^2-178x-14280=0
(2x ) (x ) << I cant find the factors