exam Maths Puzzle Numerical Ability

and this problem also. Thank you so much..

f(x)=2x^2-8x+3
What is the vertex

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exam Other Question

Write an equation of the line that passes through the given point and has the given slope

(3,1), m+4 Consider the equation ky+2x=7. For what will be the value of k if the slope is 1?