78.6k views
5 votes
X=
(1)/(2+√(3) )
y=
(1)/(2-√(3) )

x+y=

1 Answer

3 votes

Answer:

4

Explanation:

Simplify x and y by rationalising the denominator of both

To rationalise the denominator multiply the numerator/ denominator by the conjugate of the denominator.

The conjugate of 2 +
√(3) is 2 -
√(3)

The conjugate of 2 -
√(3) is 2 +
√(3)

x =
(1(2-√(3)) )/((2+√(3))(2-√(3)) ) =
(2-√(3) )/(4-3) = 2 -
√(3)

y =
(1(2+√(3)) )/((2-√(3))(2+√(3)) ) =
(2+√(3) )/(4-3) = 2 +
√(3)

Thus

x + y = 2 -
√(3) + 2 +
√(3) = 4

User Svend
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