A complex number of the form z = a + bi has an absolute value of 4.00. What could the values of a and b be?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

A. use the formula for continuous compounding with the original example: $1000 invested at 2% for 1 year. record the amount to 5 decimal places. use a calculator. b. compare it to the result using the original compound interest formula with n = 365 calculated to 5 decimal places. which has a larger value? explain.