If x (5+x)=40then Find x.​

Answers (1)

 x (5+x)=40 

x2 + 5x -40 = 0

x^2 + 5x -40 = 0\\ x =\frac{-5\pm\sqrt{(5)^2-4 \times 1 \times -40}}{2} \\ x =\frac{-5\pm\sqrt{25+160}}{2} \\ x =\frac{-5\pm\sqrt{185}}{2} \\

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