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EastWind [94]
3 years ago
8

What is the answer to 9 + 11.

SAT
2 answers:
Ilia_Sergeevich [38]3 years ago
4 0

20............... .. .

hodyreva [135]3 years ago
3 0

Answer:

20

Explanation:

11+9=20

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The positive solution to the equation x^2- 4 = 6
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Answer:

In the form of a+\sqrt{b},

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Explanation:

The equation can be rewritten as:

x^{2} -6x-4=0

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x=\frac{-b+-\sqrt{b^{2}-4ac} }{2a} \\\\=\frac{-(-6)+-\sqrt{(-6)^{2} -4(1)(-4)} }{2(1)} \\\\=\frac{6+-\sqrt{36+16} }{2} \\\\=\frac{6+-\sqrt{52} }{2} \\\\=\frac{2(3)+-2\sqrt{13} }{2} \\\\=\left \{ {{x_{1}=3+\sqrt{13} } \atop {x_{2}=3-\sqrt{13} }} \right.

Find the solution that's positive:

\left \{ {{x_{1} = 3+\sqrt{13} = 6.605551275... } \atop {x_{2} = 3-\sqrt{13} = -0.605551275... }} \right

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In the form of a+\sqrt{b},

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