+0  
 
0
3
1
avatar+328 

The quadratic equation $x^2-mx+24 = 10$ has roots $x_1$ and $x_2$. If $x_1$ and $x_2$ are integers, how many different values of $m$ are possible?

 Jul 23, 2024

Best Answer 

 #1
avatar+1804 
+1

First, let's simplify the equation so that we have a quadratic equal to 0. We have

\( x^2 – mx + 24 = 10    \\ x^2 – mx + 14 = 0  \)

 

The coefficient of x is the sum of the factors of 14   

The integer factors of 14 are (2, 7) and (–2, –7)   

                                         and (1, 14) and (–1, –14)   

 

So m could equal 9 or –9 or 15 or –15   

 

Therefore, m could have 4 possible values    

 

Thanks! :)

 Jul 23, 2024
edited by NotThatSmart  Jul 23, 2024
 #1
avatar+1804 
+1
Best Answer

First, let's simplify the equation so that we have a quadratic equal to 0. We have

\( x^2 – mx + 24 = 10    \\ x^2 – mx + 14 = 0  \)

 

The coefficient of x is the sum of the factors of 14   

The integer factors of 14 are (2, 7) and (–2, –7)   

                                         and (1, 14) and (–1, –14)   

 

So m could equal 9 or –9 or 15 or –15   

 

Therefore, m could have 4 possible values    

 

Thanks! :)

NotThatSmart Jul 23, 2024
edited by NotThatSmart  Jul 23, 2024

2 Online Users

avatar