x+x4=4
বা, x2 + 4x=4
বা, x2 + 4 = 4x
বা, x2 - 4x + 4 =0
বা, x2- 2. x. 2 +22=0
বা, (x - 2)2 = 0
বা, x-2=0
∴ x=2
এখন, xx2 + x - 2 =222 + 2 -2 = 24=12.
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