book Maths Puzzle Numerical Ability

What is the vertex of this parabola? (x-4)^2=2y

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book Other Question

I am not sure what to do.

(a) What is the sum of the roots of the equation ax squared + bX + c = 0
(b) What is the product of its roots? solve the systems of equations by finding the inverse of the coefficient matrix

3x-y= 5
2x+3y= 1