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Arman

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a² +5=0 or,a²=0-5 or,a²-0=-5 or,a²=-5 or,a=√-5 (√-5)²+5=-5+5=0(proved)

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ArfanAli

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12 = (-1)2
বা, 1 = -1 [বর্গমূল করে]
বা, 1+1=0
বা, 2 = 0
বা, 1 = 0
বা, 5 = 0
বা, 5-5 = 0-5
বা, 0 = -5............. (1)
এখন, (a)2 = (-a)2
বা, a = -a
বা, a+a = 0
বা, 2a = 0
বা, a = 0
বা, a2 = 0
বা, a2 = -5 [1 নং হতে]
অতএব, a2 + 5 = 0 [ proved ]
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