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tatuchka [14]
3 years ago
7

Solve x² + 9x + 9 = 0 What is the answer and how did you work it out?

Mathematics
1 answer:
aleksandrvk [35]3 years ago
5 0

Answer:

A) x=\frac{-9\pm3\sqrt{5}}{2}

Step-by-step explanation:

ax^2+bx+c=0

x^2+9x+9=0

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

x=\frac{-9\pm\sqrt{9^2-4(1)(9)}}{2(1)}

x=\frac{-9\pm\sqrt{81-36}}{2}

x=\frac{-9\pm\sqrt{45}}{2}

x=\frac{-9\pm3\sqrt{5}}{2}

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