Question

27
Given that √5 is irrational number prove that 2–√15 is irrational number.​

Answer 1

Answer:

√5 is an irrational number

since, the multiplication of an irrational number with a rational number is always irrational,

therefore,

(√5 × 3 )= √15 is an irrational number

since, the subtraction of an irrational number from a rational number is always irrational,

therefore,

2 - √15 is an irrational number

hence, proved.

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