(x+1)(x-1) ;)
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Answer: x=* right ?
-1*-1 = +1
-1*-1*-1=-1 !
-*-=+
-*-*-=-
Answer: To multiply three numbers, multiply the first two, then multiply the result with the third. Also: If you repeatedly multiply by a factor of -1, you will alternately get 1, -1, 1, -1, etc.
times one
<P>
<P>Any number multiplied by 1 will be itself.
<P>1x2=2
<P>1x3=3
<P>and so on</P>
1 x 1 = 1 this is because anything times one equals itself so if one is multiplying against itself it equals one.
x3 + x2 - x - 1 = x2(x+1) - 1(x+1) =(x+1)(x2-1) = (x+1)(x+1)(x-1)
(x - 1)/x = x/x - 1/x = 1 - 1/x
(x - 1)(x - 1)(x - 1) - (x + 1)(x + 1)(x + 1)
Note that x² - 1 can be written as: x² + x - x - 1 Then, factor-by-group the expression to get: x(x + 1) - (x + 1) = (x - 1)(x + 1) Hence, x2 - 1 = (x + 1)(x - 1)
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