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OpenStudy (anonymous):
(x+2)(x-7)>0 I got (-2, 7) but it says its wrong?
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jimthompson5910 (jim_thompson5910):
(x+2)(x-7)=0 what are the solutions to the equation above?
OpenStudy (anonymous):
-2 and 7?
jimthompson5910 (jim_thompson5910):
Draw out a number line with 0 in the middle |dw:1412220530445:dw|
jimthompson5910 (jim_thompson5910):
then plot x = -2 and x = 7 on this number line |dw:1412220563713:dw|
jimthompson5910 (jim_thompson5910):
at these points, the expression (x+2)(x-7) is 0 |dw:1412220596286:dw|
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