# Khan/khan-exercises

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 9fa901c Polynomial exercise name changes and other nits beneater authored Jan 27, 2012 1 12f5d25 Change wording of factoring questions petercollingridge authored May 23, 2014 2 cde9e9f Re-run the exercises through the updated cleaner. jeresig authored Apr 24, 2013 3 e9807ff Clean up the exercise files using the new cleaning utility. jeresig authored Apr 16, 2013 4 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 5 Factoring difference of squares 1 ac1415e Use requirejs for module loading spicyj authored Mar 5, 2014 6 9fa901c Polynomial exercise name changes and other nits beneater authored Jan 27, 2012 7 8 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 9
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571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 13 randRange(2, 9) 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 14 -A * A 15 12f5d25 Change wording of factoring questions petercollingridge authored May 23, 2014 16 17 18 Factor the expression below completely. All coefficients should be integers. 19 20 21 22 x^2 23 +- 24 abs(CONSTANT) 25 9fa901c Polynomial exercise name changes and other nits beneater authored Jan 27, 2012 26 571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 27 28 (x + A)(x - A) 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 29
9fa901c Polynomial exercise name changes and other nits beneater authored Jan 27, 2012 30 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 31 12f5d25 Change wording of factoring questions petercollingridge authored May 23, 2014 32 33 34 The expression is in the form \pink{a^2} - \blue{b^2}, 35 which is a difference of two squares so we can factor it as 36 (\pink{a} + \blue{b})(\pink{a} - \blue{b}). 37 38 39$("#question-x").addClass("hint_pink"); 40 $("#question-c").addClass("hint_blue"); 41 42 571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 43 What are the values of \pink{a} and \blue{b}? 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 44
571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 45

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

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

4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 47 48 571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 49 Use the values we found for \pink{a} and \blue{b} 50 to complete the factored expression, 51 (\pink{a} + \blue{b})(\pink{a} - \blue{b}). 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 52

571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 53

4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 54 So we can factor the expression as: 571d54d Change answer type to expression and tweak hints petercollingridge authored Apr 9, 2014 55 (\pink{x} + \blue{A})(\pink{x} - \blue{A}) 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 56

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cde9e9f Re-run the exercises through the updated cleaner. jeresig authored Apr 24, 2013 61 62
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