Question 135770
1)3 then square root sign 45 + 7 then square root sign 20
3*sqrt(45)+7sqrt(20)
=3*3*sqrt(5) + 7*2*sqrt5
=9sqrt(5) + 14sqrt(5)
=23sqrt(5)
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2)3 then cubed in the square sign then 16 under the square sign + cubed then 54 under the square root sign.
3*(16)^(1/3) + (54)^(1/3)
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= 3*2*2^(1/3) + 3*2^(1/3)

= 6*2^(1/3) + 3*2^(1/3)

= 9*2^(1/3)
Or
=9*cuberoot of 2
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Cheers,
Stan H.