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80. Solve the equation
![{\displaystyle x^{3}+3x^{2}-4x-12=0}](https://wikimedia.org/api/rest_v1/media/math/render/svg/fb570f10d0b19cf3c99831e65ceedbe9d1061a83)
.
![{\displaystyle \{-3,-2,2\}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/f9a8101ad8081116b1f156809c52fefc0f639ccb)
![{\displaystyle \{-3,-2,2\}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/f9a8101ad8081116b1f156809c52fefc0f639ccb)
81. Solve the equation
![{\displaystyle \displaystyle {\frac {2x+1}{x+4}}+3={\frac {-2}{x+4}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/27bf54c0c533b670667a4e08f671635c1e458b37)
.
![{\displaystyle x=-3}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a0f2b353db7dfc28d1d80b789ffc2e4a63c3a2a0)
![{\displaystyle x=-3}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a0f2b353db7dfc28d1d80b789ffc2e4a63c3a2a0)
82. Solve the equation
![{\displaystyle x={\sqrt {2x+3}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ad7d2634f211fff252a8a9f3eec33baa3395f735)
.
![{\displaystyle x=3}](https://wikimedia.org/api/rest_v1/media/math/render/svg/871a5063af170fa536b144fbcc5745146a42cc13)
![{\displaystyle x=3}](https://wikimedia.org/api/rest_v1/media/math/render/svg/871a5063af170fa536b144fbcc5745146a42cc13)
83. Solve the equation
![{\displaystyle 4x^{4/5}-54=270}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a58a68a7cbcecc260c56317f752ebccdaf647dce)
.
![{\displaystyle x=243}](https://wikimedia.org/api/rest_v1/media/math/render/svg/dadaab548ed5ada01044a9c8d75b0e43697709cd)
![{\displaystyle x=243}](https://wikimedia.org/api/rest_v1/media/math/render/svg/dadaab548ed5ada01044a9c8d75b0e43697709cd)
84. Solve the equation
![{\displaystyle 6x^{6}+x^{3}-15=0}](https://wikimedia.org/api/rest_v1/media/math/render/svg/c58a6bccfe18a8fad6d0f6b7ebac54d9623a6381)
.
![{\displaystyle \left\{{\sqrt[{3}]{\frac {3}{2}}},{\sqrt[{3}]{-{\frac {5}{3}}}}\right\}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b4aa074cb7d7e289978162b694b5dc82340245a5)
![{\displaystyle \left\{{\sqrt[{3}]{\frac {3}{2}}},{\sqrt[{3}]{-{\frac {5}{3}}}}\right\}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b4aa074cb7d7e289978162b694b5dc82340245a5)
90. Find the distance between points
![{\displaystyle (3,5)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/668ac9f38b99fd73f00a9448e72d4d92f2ff3231)
and
![{\displaystyle (-2,17)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/47b0fa1d0b856e09ef199b76f266efb050b178a6)
.
91. Find the midpoint of the line segment connecting points
![{\displaystyle (-4,7)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/6b2e7c1a0ee81577e00006c2182055ba03ea812c)
and
![{\displaystyle (2,-1)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/83bfbf011eb076603a28a53c37d9974d726d70a3)
.
![{\displaystyle (-1,3)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d9d16379ad1374665a70318fffffa4c02815d901)
![{\displaystyle (-1,3)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d9d16379ad1374665a70318fffffa4c02815d901)
92. Find the intercepts of the graph of the equation
![{\displaystyle 3y=12-4x}](https://wikimedia.org/api/rest_v1/media/math/render/svg/83636a33d0741db7576d40f2db0eceb2a334de99)
.
x-intercept at
, y-intercept at ![{\displaystyle (0,4)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/9ae659811e48549c147211e4842a39d65164c199)
x-intercept at
, y-intercept at ![{\displaystyle (0,4)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/9ae659811e48549c147211e4842a39d65164c199)
93. Sketch the graph of the function
![{\displaystyle y=x^{2}-x-2}](https://wikimedia.org/api/rest_v1/media/math/render/svg/61efa8d731eb6affd257bb15138b7bef53e5ed05)
and find its intercepts.