+0  
 
0
134
1
avatar

What multiples to -18 but adds to 3 

 May 12, 2022
 #1
avatar+9461 
0

So, 

\(\begin{cases}x + y = 3\\xy = -18\end{cases}\)

 

You can check by calculating the sum and product that x = 6, y = -3 is a solution.

 

Alternatively, if you know how to solve a quadratic equation, by Vieta's formula, x and y are the roots of \(t^2 - 3t - 18 = 0\).

 May 12, 2022
edited by MaxWong  May 12, 2022

15 Online Users