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=> √(4*2) - √(4*5) + 3√(9*5) - √(36*2)
=> 2√2 - 2√5 + 9√5 - 6√2
=> 7√5 - 4√2
b.) 6√72 - 6√8 + √20 - 3√45
=> 6√(36*2) - 6√(4*2) + √(4*5) - 3√(9*5)
=> 36√2 - 12√2 + 2√5 - 9√5
=> 24√2 - 7√5
c.) √42 - 2√13 + √1024 + √32
=> √42 - 2√13 + √(2¹⁰) + √(16*2)
=> √42 - 2√13 + 32 + 4√2
d.) √27 + 2√243 - √81 - √225
=> √(9*3) + 2√(81*3) - √(9*9) - √(9*25)
=> 3√3 + 18√3 - 9 - 15
=> 21√3 - 24
=> 3(7√3 - 8)