The solution set: {0, -11} .
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Given: -p² − 11p = 0 ;
Multiply EACH SIDE of the equation by "-1" ; to get rid of the "negative" value ;
-1 * { -p² − 11p = 0 } ;
to get:
p² + 11p = 0 ;
On the "left-hand side" of the equation, factor out a "p" ;
p(p + 11) = 0 ;
p = 0 ;
p = -11 .
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The solution set: {0, -11} .
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