-2√18 + √72- 3√98 =-2√9*2 + √36*2- 3√49*2=-6√2 + 6√2- 21√2=-21√2
-2sqrt(2*9)+sqrt(36*2)-3sqrt(49*2)=-2*3sqrt2+6sqrt2-3*7sqrt2=-6sqrt2+6sqrt2-21sqrt2=-21sqrt2
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-2√18 + √72- 3√98 =-2√9*2 + √36*2- 3√49*2=-6√2 + 6√2- 21√2=-21√2
-2sqrt(2*9)+sqrt(36*2)-3sqrt(49*2)=-2*3sqrt2+6sqrt2-3*7sqrt2=-6sqrt2+6sqrt2-21sqrt2=-21sqrt2