7m2 – 84 = 0


(xxii) 7m2 – 84 = 0

Sol. 7m2 – 84 = 0

∴  7(m2 – 12) = 0

∴ m2 – 12 = 0/7

∴ m2 – 12 = 0

∴ m2 = 12

∴ m = ±√12

∴ m = ±√(2× 2× 3)  

∴ m = ± 2√3

∴ m = 2√3 or  - 2√3   

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