Question

calcule:
a)√2-√8
b)√3-2√2+√27
c)√125+√20+√45

Answer 1

a)√2-√8 = √2 - √2².2 = √2 - 2√2 = - √2

b)√3 - 2√2 + √27 = √3 - 2√2 - √3².3 = √3 - 2√2 - 3√3  = - 2√2 - 2√3 = -(√2 +2√3)

c)√125+√20+√45 = √5².5 + √2².5 + √3².5 = 5√5 + 2√5 + 3√5 = 10√5