exam Maths Puzzle Numerical Ability

what can a and k be so both points are on the graph of function?
points are (1,11) and (2,-19); function is y= a(x+1)^2 + k
how can i find the function so that both poitns are on the graph??

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exam Other Question

Suppose your school is having a talent show to raise money for new music supplies. you estimate that 200 studens and 150 adults will attend.you estimate $200 in expenses. write an find the coordinates of the vertex and determine whether the graph opens up or down.

y=x2-5