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=5-3√2+2+2√2×√4
=5+2-3√2+4√2
=7+√2
2. (2-4√2)(5+√8)
=2(5+√8)-4√2(5+√8)
=10+2√8-20√2-4√16
=10+2√2×√4-20√2-4×4
=10+4√2-20√2-16
=-6-16√2
3. 2√5/2 + √5
=√5+√5
=2√5