# If x=1/2-sq root 3,find the value of x3-2x2-7x+5

2
by vikasvini

2015-04-26T00:40:42+05:30

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Multiply the numerator and denominator by the conjugate of the denominator

Now consider the given expression

2015-04-26T01:14:53+05:30

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We rationalize the denominator to find x.

since, the expression of x is simple, we find x² and x³  by simple multiplication.  If the expression for x were complicated, then we could find some other simple means.

Now we calculate the value of the polynomial in x: