Question

a)√2-√8=b)√125+√20-√45=c)√72-√18+√20= d)√112+√14-√28=e)√128-√50 +√200=f)√8+√32+√72-√50=

Answer 1

√2 - √8 = 
√2 - √4.2 =
√2 - 2√2 = - √2
-------------------------------------------------------------
√125 + √20 - √45 =
√25.5 + √4.5 - √9.5 =
5√5 + 2√5 - 3√5 =
7√5 - 3√5 = 4√5
----------------------------------------------------------------
√72 - √18 + √20 =
√36.2 - √9.2 + √4.5 =
6√2 - 3√2 + 2√5 =
3√2 - 2√5
----------------------------------------------------
√112 + √14 - √28 = 
√16.7 + √14 - √4.7 =
4√7 + √14 - 2√7 =
4√7 - 2√7 + √14 =
2√7 + √14
--------------------------------------------
√128 - √50 + √200 = 
    6
√64.2 - √25.2 +√100.2 =
8√2 - 5√2 + 10√2 =
18√2 - 5√2 = 13√2
--------------------------------------------------------------
√8 + √32 + √72 - √50 =
√4.2 + √16.2 + √36.2 - √25.2 =
2√2 + 4√2 + 6√2 - 5√2 =
12√2 - 5√2 = 7√2