Question

8-2root5 contradiction method​

Answer 1

Answer:

let the given number is rational number

so, 8-2√5 =p/q                            {where q≠0}

-2√5 =p/q  -8  

2√5 =   -p/q  +8  

2√5 = (8q -p)/q

√5 = (8q -p)/2q

here , (8q -p)/2q is a rational number but it is equal to irrational number

so, it is a irrational number

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