exam Maths Puzzle Numerical Ability

what are all the names that apply to a square

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exam Other Question

If f(x) = 4x - 3,
find f(-1)
findf(a-2)
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