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Solve the inequality $x(x + 6) > 16 - 5x + 33.$ Write your answer in interval notation.

 
 Jan 5, 2025
 #1
avatar+130071 
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x ( x + 6) >  16 - 5x + 33        simplify as

 

x^2 + 11x - 33   >  0          set up  as an equality....use the quad formula to find the roots

 

x =  [ -11 + / - sqrt [ 11^2 - 4 * 1 * -33 ] ] / 2

 

x = [ -11 +/ -  sqrt 253 ] /2

 

This is a parabola intersecting the x axis......we are interested in the parts lying above the axis

 

These are  ( -inf, (-11 - sqrt 253 ) / 2 ) U ( (-11 +  sqrt 253) / 2 , inf) =  solution

 

 

cool cool cool

 Jan 5, 2025

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