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= 2a√b + √(4.2)ab² + 5b√a - 6a√b
= 2a√b + 2b√2a + 5b√a - 6a√b
= 2a√b - 6a√b + 2b√2a + 5b√a
= -4a√b + 2b√2a + 5b√a
b) √32x²y^3 - √50xy² - 3√2x²y^3 + 5y√2x
= √(16.2)x²y^3 - √(25.2)xy² - 3√2x²y^3 + 5y√2x
= 4xy√y - 5y√2x - 3xy√y + 5y√2x
= 4xy√y - 3xy√y - 5y√2x + 5y√2x
= xy√y
c) 9a√a²b^3 + 2b√a^4b + a²√b^3 + 7√a^4b^3
= 9a.a.b√b + 2b.a²√b + a².b√b + 7.a².b√b
= 9a²b√b + 2a²b√b + a²b√b + 7a²b√b
= (9+2+1+7).a²b√b
= 19a²b√b