(7-3)^2 plus (7-1)^2 = 16+36
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You don't "solve" an expression. You can solve an equation; an expression can be simplified or otherwise manipulated, and if you know the value of "x" (in this case), you can evaluate its value.
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
The answer is b+1. Therefore the algebraic expression for this is b+1
14
When simplified it is just: 1