The horizontal bar in the
radical sign tells how much of the expression is the radicand. In this expression:
the bar stretches across the whole expression p - q. So this means we subtract q from p, then find the square root of the result.
The whole expression "p-q" is the radicand.
If it has only covered the 'p' like this:
it would mean find the square root of p then subtract q from the result. Only "p" is the radicand.
The bar acts like parentheses, telling you how to group items and the order of calculation.
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