Question

Rationalise the denominator.
please urgent.​

Answer 1

Step-by-step explanation:

for rationalising we need to multiply the fraction by (2√3-√5)/(2√3-√5)

now 4√5/(2√3+√5) * (2√3-√5)/(2√3-√5)

this gives us

4√5*(2√3-√5) / (2√3+5)*(2√3-√5)

since( a+b)(a-b) = a²- b²

8√15 - 4(5)/ 12-5

(8√15 - 20)/ 7