exam Maths Puzzle Numerical Ability

I am trying to solve by using quadratic formula
x^2-9x-4=6
I am confused on what to do with =6, do I rule it out when I begin simplifying?
Please help

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exam Other Question
what are all the names that apply to a square Determine the maximum possible number of turning points for the graph of the function:
f(x)= x to the fifth power + 2x to the sixth power