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2X * X + 3 = 100
do what it says; multiply
2X2 + 3 = 100
subtract 3 from each side
2X2 = 97
divide each side by 2
X2 = 97/2
take square root both sides
X = sqrt(97/2)
you could rationalize the denominator by this method, form of one
X = sqrt(97/2)
same as saying
X = sqrt(97)/sqrt(2) ( use sqrt(2)/sqrt(2) as form of one )
X = sqrt(97)/sqrt(2) * sqrt(2)/sqrt(2)
X = sqrt(194)/2
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