Answer:
[tex]\frac{b^2}{2}[/tex]
Step-by-step explanation:
We are supposed to write an algebraic expression for given word phrase.
The square of b would be 'b' raised to second power: [tex]b^2[/tex].
Half the square of b would be [tex]b^2[/tex] divide by 2: [tex]\frac{b^2}{2}[/tex].
Therefore, our required expression would be [tex]\frac{b^2}{2}[/tex].
