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aleksklad [387]
3 years ago
9

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

SAT
1 answer:
VARVARA [1.3K]3 years ago
7 0

Answer:

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

  • a = 3
  • b = 13

Explanation:

The equation can be rewritten as:

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

Find the solutions using the quadratic formula:

  • a = 1
  • b = -6
  • c = -4

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

Therefore, the solution would be 3+\sqrt{13}.

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

  • a = 3
  • b = 13
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