m2 – 84 = 0


(v). m2 – 84 = 0

Sol. m2 – 84 = 0

∴ m2 = 84


∴ m = ±√84

∴ m = ±√(2× 2× 3× 7)

∴ m = ±2√(3× 7)

∴ m = ± 2√21


∴ m = 2√21  or – 2√21 

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