exam Maths Puzzle Numerical Ability

Write the quadratic equation with a lead coefficient of 1 whose roots are 2-3i and 2+3i.

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I don't recall learning this and I have finals coming up - please help.

The function h(x) was used to generate the following code:
63,18,60,63,30,60,48,69,18,57
Decode this me 5 Square root 12(3)