chriskarlson344
chriskarlson344 chriskarlson344
  • 22-06-2017
  • Mathematics
contestada

Solve 2x2 + 12x = 10

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Аноним Аноним
  • 22-06-2017
x is 0.5 as 2x2 is 4 so 10-4=6 so what number times by 12 makes 6 and it is 0.5

x=0.5
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Banabanana
Banabanana Banabanana
  • 22-06-2017
[tex]2x^2+12x=10 \\ 2x^2+12x-10=0 \ \ |:2 \\ x^2+6x-5=0 \\ D=b^2-4ac=6^2-4*1*(-5)=36+20=56 \\ x_{1,2}= \frac{-bб \sqrt{D} }{2a} \\ \\ x_1= \frac{-6- \sqrt{56} }{2}= \frac{-6- 2\sqrt{14} }{2}=\frac{2(-3- \sqrt{14}) }{2}=-3- \sqrt{14} \\ \\ x_2= \frac{-6+ \sqrt{56} }{2}= \frac{-6+ 2\sqrt{14} }{2}=\frac{2(-3+ \sqrt{14}) }{2}=-3+ \sqrt{14} [/tex]
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