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# What multiples to -18 but adds to 3

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What multiples to -18 but adds to 3

May 12, 2022

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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