# Khan/khan-exercises

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 Factoring difference of squares 1
randRange(2, 9) -A * A

Factor the expression below completely. All coefficients should be integers.

x^2 +- abs(CONSTANT)

(x + A)(x - A)

The expression is in the form \pink{a^2} - \blue{b^2}, which is a difference of two squares so we can factor it as (\pink{a} + \blue{b})(\pink{a} - \blue{b}).

$("#question-x").addClass("hint_pink");$("#question-c").addClass("hint_blue");

What are the values of \pink{a} and \blue{b}?

\qquad \pink{a = \sqrt{x^2} = x}

\qquad \blue{b = \sqrt{A * A} = A}

Use the values we found for \pink{a} and \blue{b} to complete the factored expression, (\pink{a} + \blue{b})(\pink{a} - \blue{b}).

So we can factor the expression as: (\pink{x} + \blue{A})(\pink{x} - \blue{A})