3sqrt(7) + 7sqrt(63) - sqrt(7)
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3✓7+7✓63-✓7
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7√63 - 3√7 = 7√(9*7) - 3√7 = 7*3*√7 - 3√7 = (21 - 3)√7 = 18√7
sqrt(7√63 - 3√7) = sqrt(18√7) = sqrt(9)*sqrt(2*√7) = 3*sqrt(2*√7)
3*sqrt(2*√7) = 3*sqrt(√4*√7) = 3*sqrt(√28) = 3 * ∜(28)
sqrt(7√63 - 3√7) = sqrt(18√7) = sqrt(9)*sqrt(2*√7) = 3*sqrt(2*√7)
3*sqrt(2*√7) = 3*sqrt(√4*√7) = 3*sqrt(√28) = 3 * ∜(28)
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