Please Take Advantage Of My Nostalgic Moment

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Unless the sight of serious algebra

causes serious suicidal thoughts
...
...
  

Once upon a time
I called this
a JBL equation
That is,

you can solve this 
Just By Looking

 The equation has two of everything:

15 appears twice
X appears twice

There are two Plus Signs 

and there are two

square root thingies

The question is

SOLVE FOR  X

Three simple steps

is all it takes.

 ❶ Subtract 1 from 15   [=14]

❷ Take half of that result  [=7] 

❸ Multiply it by itself [= 49]

    

Therefore

X = 49

...

...

Regardless of what
the number is
(as long as it is an odd #)
do the same three steps:

IF

all things were the same

but the number = 11

[instead of 15]

THEN

11 ⇛ 10 ⇛ 5 ⇛ 25

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Footnote
This is the rarest of pages
where the dark (or red) print
does not indicate a hyperlink.

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