Question

with step by step explanation state whether the number in the picture is rational or irrational​

Answer 1

here , we know that

• $\sf {(a - b)}^{2} = (a + b)(a - b)$

then ,

• a = 2 , b = √5

$\sf \: {(2 - \sqrt{5)} }^{2} = {(2)}^{2} - {( \sqrt{5)} }^{2} = 4 - 5 = - 1$

This is Rational Number

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