Question

8) a=√9m ,b=2√100m, c=-8√36m e determine:

A)a+b+c=
B)a-(b+c)=
C)a-b+c=
D)(a+b)-c=

Answer 1

8)
a = √9 ; b = 2√100   ; c = 8√36
A)a + b + c =
√9 + 2√100 + 8.√36 = 
3 + 2.10 + 8. 6 = 
3 + 20 + 48 = 71

B)a - (b + c) = 
√9 - (2√100 + 8√36) =
 3 - (2 .10 + 8 . 6 ) = 
 3.- (20 + 48) = 
3 - (68) = - 65

C)a - b + c = 
√9 - 2√100 + 8√36 = 
3 - 2.10 + 8. 6 =
3 - 20 + 48 = 
-17 + 48 = + 31

D)(a + b) - c = 
(√9 + 2√100)  - 8√36 = 
( 3 + 2. 10 ) - 8. 6 = 
(3 + 20 ) - 48 =
23 - 48 = - 25