SOLUTION: <pre>Write a quadratic equation that has the following two solutions: x = 4 and x = -9) here is my equation (x - 4)(x + 9) = 0 x² + 5x - 36 = 0</pre>

Algebra ->  Rational-functions -> SOLUTION: <pre>Write a quadratic equation that has the following two solutions: x = 4 and x = -9) here is my equation (x - 4)(x + 9) = 0 x² + 5x - 36 = 0</pre>       Log On


   

Question 39613: 
Write a quadratic equation that has the following two solutions: 
x = 4 and x = -9) 
here is my equation

 (x - 4)(x + 9) = 0
  
   x² + 5x - 36 = 0
Answer by AnlytcPhil(1810) About Me  (Show Source):
You can put this solution on YOUR website!
Write a quadratic equation that has the following two
solutions:
  
x = 4 and x = -9) 

here is my equation

 (x - 4)(x + 9) = 0
  
   x² + 5x - 36 = 0 
 
Substitute y temporarily for 0
and plot this graph

y = x² + 5x - 36


+graph%28200%2C+200%2C+-12%2C+19%2C+-50%2C+50%2C+x%5E2+%2B+5%2Ax+-+36+%29+

But since we substituted y for 0, we can only use the two points
on that graph where y actually is 0, and those two points are
(-9,0) and (4,0), where the graph crosses the x-axis. 

Edwin
AnlytcPhil@aol.com