Factor quadratic expressions of the general difference of squares form: (ax)^2-b^2. The factored expressions have the general form (ax+b)(ax-b).


Sean and Dana were each asked to factor the quadratic expression 100, minus, x, start superscript, 2, end superscript. Their responses are shown below.
left parenthesis, 10, plus, x, right parenthesis, left parenthesis, 10, minus, x, right parenthesisleft parenthesis, x, plus, 10, right parenthesis, left parenthesis, x, minus, 10, right parenthesis
Which student wrote an expression that is equivalent to 100, minus, x, start superscript, 2, end superscript ?
Please choose from one of the following options.