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= 3√800 - √8000
= 3√(400x2) - √(1.600x5)
= 3x20√2 - 40√5
= 60√2 - 40√5
= 20 (3√2 - 2√5)
B. x (√7 + √112)
=
=
=
=
=
= x
=
=
C. (4√5)² + √5 - 3√8 x 5
= 16x5 +√5 - 3√(4x2) x 5
= 80 x 5 + √5 - 3.2√2
= 400 + √5 - 6√2