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| Question 149036:  If x=1 and x= -8, then form a quadratic equation
 Answer by mangopeeler07(462)
      (Show Source): 
You can put this solution on YOUR website! in a quadratic equation, for x, you solve for the value that would make an expression zero.  So if x=1 and x= -8, just move backwards. 
 For positive x's
 (x-b)=0
 For negative x's
 (x+b)=0
 
 plug in your x's
 (1-b)=0
 (-8+b)=0
 
 Solve for b's
 b=1
 b=8
 
 So the original equation was
 (x-1)(x+8)=0
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