Question

Which number is the best approximation for 4v5 -2v3
0.5
5.4
6.9
12.2

Answer 1

6.9

Explanation:

4v5 -2v3

set it equal to 0

4v5 -2v3=0

Move all terms to the left side and set equal to zero. Then set each factor equal to zero.

Exact Form:

v = 0 , √ 2/ 2 , − √ 2 /2

Decimal Form:

v = 0 , 0.70710678 ... , − 0.70710678

So, it would be 6.9