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1. $m^{2}$

A. 3m
B. 3m
C. 3m
D. 3m

Answer: Option E

Explanation:

আমরা জানি,

{(a - b)}^{2} = {(a + b)}^{2} - 4 a b \Rightarrow {(a - b)}^{2} = {(9 m)}^{2} - 4.18 m^{2} \Rightarrow {(a - b)}^{2} = 81 m^{2} - 72 m^{2} \Rightarrow {(a - b)}^{2} = 9 m^{2} \Rightarrow a - b = \sqrt{9 m^{2}} ∴ a - b = \pm 3 m

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