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how to factor xsquared + 13x +30

how to factor x squared + 13 +30 - 2x squared + 13x +30 - 6xsquared-13x+30-the primeter of a triangular park is 16x+5 if one side is 12+5 another is 2x-1 find the missing side. A rectangualr skateboard park has a area of xsquared +11x-60 what are the possible dimensions of the park?
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1 Answer

 X^ 2 + 13X + 30 
 
 Factor it to:
 
   ( X + a ) ( X +b) , where a+ b = 13 , and a.b = 30 , which gives a = 10  b =3 
 
 X^2 + 13 X + 30 = ( X + 10 ) ( X +3 )