0
Anonymous
The value of that expression depends on the value of "x". You can't really simplify it, except that you can factor it by separating the common factor "x".
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x2 - 4x - 21 = (x-7)(x+3)
7
4x + 20
x(4x-2)
x2-4x-165 = (x-15)(x+11) when factored