Danish11 Danish11

05-07-2017
Mathematics

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konrad509 konrad509

05-07-2017

a)
[tex]x+3[/tex]

b)
[tex]x(x+3)=340\\ x^2+3x-340=0[/tex]

c)
[tex]x(x+3)=340\\ x^2+3x-340=0\\ \Delta=3^2-4\cdot1\cdot(-340)=9+1360=1369\\\sqrt{\Delta}=37\\ x_1=\dfrac{-3-37}{2}=-20\\ x_2=\dfrac{-3+37}{2}=17[/tex]

It's 17.

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