umahmad umahmad

21-06-2015
Mathematics

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

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konrad509 konrad509

21-06-2015

\(x+2x^2=36\\ 2x^2+x-36=0\\ 2x^2+9x-8x-36=0\\ x(2x+9)-4(2x+9)=0\\ (x-4)(2x+9)=0\\x=4 \vee x=-\dfrac{9}{2}\)

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