Which number is the best approximation for 4v5 - 2v3

0.5

5.4

6.9

12.2

6.9

Step-by-step 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