1 by root 50 simplest rationalising factor

1/5V2    or

V2/10

Step-by-step explanation:

1/V50=1/V5^2*2=1/5V2

rationalizing  by  multiply by V2

1*V2/5V2*V2=V2/5*2=V2/10

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

if x = 1, then the answer is 3.5