(Root under x+4) - (Root under x-4) = (Root under x-1)
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( rtx + 4 ) - ( rtx - 4 ) = ( rtx - 1 )
rtx +4 -rtx + 4 = rtx - 1
0 = rtx - 1
rtx = 1
x = (1)^2
x = 1
rt means root..
i hope itz help u
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