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(2√45 + 3√20)/2√5
= {2√(5 x 9) +3√(5 x 4)}/2√5
= (2√5 × 3) + (3√5 × 2) / 2√5
= (6√5 + 6√5)/2√5
= √5(6 + 6)/2√5
= 12√5 / 2√5
= 6
So, it's a rational number.
The number is 6.
= {2√(5 x 9) +3√(5 x 4)}/2√5
= (2√5 × 3) + (3√5 × 2) / 2√5
= (6√5 + 6√5)/2√5
= √5(6 + 6)/2√5
= 12√5 / 2√5
= 6
So, it's a rational number.
The number is 6.
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