To rearrange the equation for the surface area \( S \) of a square pyramid, given by
\[ S = \frac{1}{2}lp + B, \]
where \( l \) is the slant height, \( p \) is the perimeter of the base, and \( B \) is the area of the base, we want to isolate \( B \).
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Start with the original equation: \[ S = \frac{1}{2}lp + B. \]
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Subtract \( \frac{1}{2}lp \) from both sides to isolate \( B \): \[ B = S - \frac{1}{2}lp. \]
This gives us the rearranged equation for \( B \): \[ B = S - \frac{1}{2}lp. \]