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,  42,  k2,  (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: 16-9,  49-r2,  k2-36,  (y+3)2-w2 .

- The Difference of Squares 16-9 can be factored into the two factors (4-3)(4+3).
   If you check (4-3)(4+3) , it multiplies together to give you the value 7 which is the same as 16-9.

- The Difference of Squares 49-r2 can be factored as (7-r)(7+r).
   If you check (7-r)(7+r) , it multiplies together to give you the original expression 49+7r-7r-r2 = 49-r2.
   [To review multiplying a binomial times a binomial see the other SliderMath games.]

- As a general rule, the Difference of Squares a2-b2 can be factored as (a-b)(a+b).
   You can use the two factors (a-b)(a+b) or you can use (a+b)(a-b). 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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