Sederhanakanlah, a. akar 20 - akar 45 + 5 akar 80 b. (2 - akar 3 ) (2 akar 2 - akar 5 ) c. 2 dibagi akar 5 - akar 6. Thx.

Question

Matematika Diposting : 2014-10-17 Diupdate : 2021-08-17 Dwiajy

Pertanyaan

Sederhanakanlah,

a. akar 20 - akar 45 + 5 akar 80

b. (2 - akar 3 ) (2 akar 2 - akar 5 )

c. 2 dibagi akar 5 - akar 6. Thx.

Answer 1

a. √20 - √45 + √80 + 5 = √-25 + √80 + 5 = √55 + 5 = √55 + √25 = √80

b. (2-√3) ( 2√2 - √5) = 4√2 - 2√6 -2√5 +√15

c. 2 : √5 - √6 = 2 : √-1 = 2√i

Answer 2

A. √20-√45+5√80 =2√5-3√5+5(4√5) =-√5+20√5 =19√5 B. (2-√3)(2√2-√5) =(2-√3)(2√2-√5) =(-√3+2)(2√2-√5) =-2√6 C. 2:√5-√6 =2/5√5-√6