Question

1. Prove that V5 is irrational.​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

let root 5 be rational

then it must in the form of p/q [q is not equal to 0][p and q are co-prime]

root 5=p/q

=> root 5 * q =p

squaring on both sides

=> 5*q*q = p*p

p*p is divisible by 5

p is divisible by 5

p= 5c [c is a positive integer] [squaring on both sides ]

p*p = 25c*c > 2

sub p*p in 1

5*q*q = 25*c*c

q*q = 5*c*c

=> q is divisble by 5

thus q and p have a common factor 5

there is a contradiction

as our assumsion p & q are co prime but it has a common factor

so v5 is an irrational