a+b=9m এবং a b = 18m2 হলে a − b = ?

a+b=9m এবং a b = 18m2 হলে a − b = ? Correct Answer 3 m

Typical examples of real time operating systems are those custom written for the Galileo and Voyager space probes. Because of extreme power and weight constraints, they needed to be coded extremely efficiently to use as little memory and to accomplish their tasks in as few operations as possible.
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a+b=9m এবং ‍ab=18m2 হলে, ‍a-b এর মান কত?