Question

prove that (root3+root5) is irrational no.

Answer 1

let √3+√5 be any rational number x

x=√3+√5

squaring both sides

x²=(√3+√5)²

x²=3+5+2√15

x²=8+2√15

x²-8=2√15

(x²-8)/2=√15

as x is a rational number so x²is also a rational number, 8 and 2 are rational nos. , so √15 must also be a rational number as quotient of two rational numbers is rational

but, √15 is an irrational number

but this contradicts the fact that √3+√5 is irrational

so, our assumption is incorrect

so √3+√5 is not a rational no.

.................................................Hence proved...................................

Answer 2

Hi

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