Write whether 2 root 45 + 3 root 20 upon mein 3 2 root 5 rational or irrational
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Question is a bit ambiguous. It is not clear if 2√5 is common denominator.
Assuming common denominator, here we go :
y = (2√45 + 3√20)/2√5
y = {2√(5 x 9) +3√(5 x 4)}/2√5
y = (6√5 + 6√5)/2√5
y = √5(6 + 6)/2√5
y = 6
Yes. It is undoubtedly Rational!!!!
:-)
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