x is the 'unknown quantity'
the sum is x+4=92 so an 'unknown quantity' has 4 added to it and the answer is 92, so if we now subtract 4 from 92 we will now know what the value of x is.
92-4= 88
so x=88
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1 x 92, 2 x 46, 4 x 23 = 92
X=7 y=5
2x-4
x(x+4) equals x2 plus 4x
If the x=4, then its equivelent to 12 + 4, which equals 16.