√3 - 9 is an expression, and so there is nothing to be solved.
It can be evaluated - use a calculator!
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It is: -3-(6) = -9
Sobtract 1 from minus 9 and get minus 10.
-1/3 Make them into fractions like: 2/9-5/9 Then you just solve and you get -3/9 which reduces to -1/3
2√20 - 3√7 - 2√5 + 4√63 = 2√(4 x 5) - 3√7 - 2√5 + 4√(9 x 7) = 4√5 - 2√5 - 3√7 + 12√7 = 2√5 + 9√7
9*radical(3)/2 = 4.5*radical(3) = 7.794 approx.