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= √5 + √3
b. √(15 + 6√6) = √(15 + 2√54)
= √((9 + 6) + 2√9.6))
= √9 + √6
= 3 + √6
c. 5x√(x + 1) - 3x√(4(x + 1)) + √(x³ . x²)
= 5x√(x + 1) - 12x√(x + 1) + x²√x
= - 7x√(x + 1) + x²√x