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nakeytrag
06.05.2020 •
Mathematics
Please help with the answer and explanation?
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Ответ:
We know that g(x) = \frac{3}{x^2+2x}
We have to find g^-1(x) or inverse of g(x)
Inverse of g(x) can be determined by equating g(x) to y, and determining the value of x in terms of y
g(x) = y = \frac{3}{x^2+2x}
⇒ y × (x² + 2x) = 3
⇒ yx² + 2xy = 3
⇒ yx² + 2yx - 3 = 0
Determining the roots of x using:
x =
OR x =
, where a is coefficient of x², b is coefficient of x, and c is the constant
⇒ x =
OR x = ![\frac{-2y - \sqrt{4y^2 - 4(2y)(-3)}}{2y}](/tpl/images/0070/0328/cfc59.png)
⇒ x =
OR x = ![\frac{-2y - \sqrt{4y^2 + 24y}}{2y}](/tpl/images/0070/0328/3f9e2.png)
Hence, g^-1(x) =
OR x = ![\frac{-2y - \sqrt{4y^2 + 24y}}{2y}](/tpl/images/0070/0328/3f9e2.png)