4·2³ /16 - v13²–4·21·2/4

Question

 

4⋅2³     √13²–4⋅21⋅2

 16              4

 

 

 

 

(13²-4⋅21⋅2) is all in the square root bracket

Answer 1

= 8/4 - sqr(169+168)/4 = 2 - sqr337/4 = about 2- 18.36/4 = 2- 4.59 = - 2.59

it's slightly less than 2-sqr(2)(13)^2/2 = 2-13/sqr2 = about -2.6

sqr(169+168) is slightly less than 13sqr2