Question

write the solution for the equation x^2 +x-2=0 in roster
form​

Answer 1

Step-by-step explanation:

$\mathtt{x = \frac{ - b \pm \sqrt{ {b}^{2} - 4ac } }{2a} }$

$\mathtt{x = \frac{ - 1 \pm \sqrt{ {1}^{2} - 4 \times 1 \times ( - 2)} }{2 \times 1} }$

$\mathtt{x = \frac{ - 1 \pm \sqrt{1 + 8} }{2} }$

$\mathtt{x = \frac{ - 1 \pm \sqrt{9} }{2} }$

$\mathtt{x = \frac{ - 1 \pm3}{2} }$

$\mathtt{x = \frac{2}{2} \quad \quad \: or \quad x = - \frac{4}{2} }$

$\mathtt{x = 1 \quad \quad \: or \: \quad \quad \: x = - 2}$

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