exam Maths Puzzle Numerical Ability

"plot all the complex numbers in the complex plane whose absolute value is 4. "

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Please show me how to solve this problem:

2t + 4s = 10
3t + 3d = 9
1t + 3d + 2s = 8
Write each polynomial as a product of linear factors.
P(x)= 3x^3 + 7x^2 - 22x - 8