Question

c)-2√80+√320-4√20+√45
d)√0.8+√3.2+√5-10√7.2

Answer 1

c) $-8 \sqrt{5} +8 \sqrt{5} - 8 \sqrt{5} + 3 \sqrt{5} = -5 \sqrt{5}$
d) $2 \sqrt{0,2} + 4 \sqrt{0,2} + 5 \sqrt{0,2} -60 \sqrt{0,2} = -49 \sqrt{0,2}$