Question

Question :-

If a and b are rational numbers and ( 4 + 3√5)/(4-3√5) = a + b, find the values of a and b.



Raj msg dekho-_-!​

Answer 1

Answer:

do this answer by rationalising the denominater

( 4 + 3√5)/(4-3√5)

=( 4 + 3√5)/( 4 + 3√5)

=(4)^2+(3√5)^2/(4)^2-(3√5)

solve it

Answer 2

Answer:

What is the value of a and b, if (3+√5) / (3-√5) =a+b√5 where a and b are rational numbers?

(3 + sqrt(5)) / (3 - sqrt(5)) = (a + b*sqrt(5)) /1 , we have one equation of 2 fractions.

The cross product gives: (3 + sqrt(5)) = (3 - sqrt(5)) * (a + b*sqrt(5))

Getting rid of the brackets: 3 + sqrt(5) = 3a + 3b*sqrt(5) - 5b - a* sqrt(5)

3 + sqrt(5) = (3a -5b) + (3b - a)*sqrt(5) Separating the Rational from the Irrational,

we get 2 linear equations: 3 = (3a -5b) and

1 = (3b - a)

Multiplying the second equation by 3 gives: 3 = - 3a + 9b

adding the first equation: 3 = 3a -5b

we get : 3+3= - 3a + 3a + 9b - 5b

Eliminating the variable a : 6 = 4 b this gives b = 6/4 = 3/2

Now knowing b=3/2 , we substitute it in 1 = (3b - a) and we get a = 7/2

The answer is: a = 7/2 ; and b = 3/2