exam Maths Puzzle Numerical Ability

I would like to know if i did this problem correct. this problem is from a work sheet.
y=2x and y=2-1
_2=2(-1) and -2=-1-1

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exam Other Question

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

Could someone show me how to this step-by-step, please?
I cannot figure this out - can someone please help.

4sqrt72 - 2sqrt48

Thank you