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= 2x4 - 3√9x2 + √9x3
= 8 - 3x3√2 + 3√3
= 8 - 9√2 + 3√3
c. 3√20 + 4√45
2√5
= 3√4x5 + 4√9x5
2√5
= 3x2√5 + 4x3√5
2√5
= 6√5 + 12√5
2√5
= 18√5
2√5
= 9