Since you know a = 5√2, start by plugging that into your other equation, 2a = √2x to get an equation where x is the only variable you need to solve for:

There are two ways of solving for x:
1) Remember when you simplify radicals, you break what's underneath the radical into smaller factors. If a factor repeats under the square root, you can take two of them out and put one of them outside the radical sign (see picture for example). For this problem, you would be doing the reverse of simplifying. You have a 10 on the outside on the left of the equal sign, but a 2 underneath on both sides. If the 10 was taken out, that means there had to be two 10's underneath the radical to begin with. Those two tens would have been multiplied since they are factors, so 10 x 10 = 100. That means x = 100.
2) Solve it algebraically. Square both sides, simplify, then divide by 2:
Answer: x = 100
The substance that is not approved for chemical sanitizing after washing and rinsing is detergent.
<h3>What is a sanitizer?</h3>
A sanitizer refer to a liquid chemical composition which is applied to the hand after washing and rinsing to remove dirt's and kills germs that may be present in the hand.
Therefore, The substance that is not approved for chemical sanitizing after washing and rinsing is detergent.
The question is incomplete, below is the completed part and options gotten from brainly website.
Quaternary ammonium
Chlorine
lodine
Detergent
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