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anonymous 5 years ago What are the solutions of x2 + 2x + 9 = 0?

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1. anonymous

There are no soluions

2. anonymous

the solution is a complex no.

3. anonymous

When you try the quadratic formula, you will have a negative number under the square root part: $\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-2\pm\sqrt{4-36}}{2}=\frac{-2\pm\sqrt{-32}}{2}$ (This is equivalent to saying the discriminant is negative). As a result, there are no real solutions to this equation.

4. anonymous

Solve x2 – 3x = 1

5. anonymous

bring the 1 to the other side, and use the same procedure as above: $x^2-3x=1 \ \ \ \Longleftrightarrow \ \ \ x^2-3x-1=0$

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