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= 12x3√3 - 2x4√3 + 5√3
= 36√3 - 8√3 + 5√3
= 33√3
b. (3√5 - √50) x √160 = 3√800 - √8000
= 3√400x2 - √400x20
= 3x20√2 - 20√20
= 60√2 - 20√20
c. √63 / √28 x (√7 x √112) = √9x7 / √4x7 x (√7 x √16x7)
= 3√7 / 2√7 x (√7 x 4√7)
= 3/2 x (4x7)
= 3/2 x 28
= 42