umahmad
umahmad umahmad
  • 21-06-2015
  • Mathematics
contestada

the sum of a number and twice is square is 36.find the numbers?

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konrad509
konrad509 konrad509
  • 21-06-2015
[tex]x+2x^2=36\\ 2x^2+x-36=0\\ 2x^2+9x-8x-36=0\\ x(2x+9)-4(2x+9)=0\\ (x-4)(2x+9)=0\\x=4 \vee x=-\dfrac{9}{2}[/tex]
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