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Which is the exact value of the expression sqrt 32- sqrt 50 + sqrt 128

2 sqrt 7
7 sqrt 2
22 sqrt 2
2 sqrt 55

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  1. sqrt(32)=sqrt(2)*sqrt(16)=sqrt(2)*4

    sqrt(50)=sqrt(2)*sqrt(25)=sqrt(2)*5

    sqrt(128)=sqrt(2)*sqrt(64)=sqrt(2)*8

    sqrt(32)-sqrt(50)+sqrt(128)=

    sqrt(2)*4-sqrt(2)*5+sqrt(2)*8=

    sqrt(2)*(4-5+8)=

    sqrt(2)*7

    OR

    7*sqrt(2)

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