
Difference of Squares Factoring Fun Help Game Tips:  Perfect squares are formed by multiplying a quantity times itself, as in (3)(3) =9 . Here are six perfect squares: 9, 25, 36, 4^{2}, k^{2}, (y+3)^{2} .  A 'Difference of Squares' expression can be formed by subtracting one perfect square from another one. Here are four 'Difference of Squares' expressions: 169, 49r^{2}, k^{2}36, (y+3)^{2}w^{2} .  The Difference of Squares 169 can be factored into the two factors (43)(4+3). If you check (43)(4+3) , it multiplies together to give you the value 7 which is the same as 169.  The Difference of Squares 49r^{2} can be factored as (7r)(7+r). If you check (7r)(7+r) , it multiplies together to give you the original expression 49+7r7rr^{2} = 49r^{2}. [To review multiplying a binomial times a binomial see the other SliderMath games.]  As a general rule, the Difference of Squares a^{2}b^{2} can be factored as (ab)(a+b). You can use the two factors (ab)(a+b) or you can use (a+b)(ab). Both answers are equivalent.  Refresh/Reload the web page to start over again.  If the game doesn't respond to keyboard input, click inside the game area to reset the game's focus.  The score report automatically appears after you have made 10 choices.  The Factors score is based on your choices only and does not count the helicopter hits.  The Game score is reduced by the number of helicopter hits.  The game speeds up as your score increases. Adjust this with the  and + keys. 
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