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siimeon42
siimeon42 siimeon42
  • 01-02-2016
  • Mathematics
Answered

xsquared + 3x - 5 solved using the quadratic formula

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unicorn3125
unicorn3125 unicorn3125
  • 01-02-2016

\(x^2+3x-5=0\\a=1;\ b=3;\ c=-5\\\\ x=\frac{-b^+_-\sqrt{b^2-4ac}}{2a}\\\\x=\frac{-3+\sqrt{3^2-4\cdot1\cdot(-5)}}{2\cdot1}\quad\vee\quad x=\frac{-3-\sqrt{3^2-4\cdot1\cdot(-5)}}{2}\\\\x=\frac{-3+\sqrt{9+20}}{2}\quad\vee\quad x=\frac{-3-\sqrt{9+20}}{2}\\\\x=\frac{-3+\sqrt{29}}{2}\quad\vee\quad x=\frac{-3-\sqrt{29}}{2} \\\\x\approx1.19\quad\vee\quad x\approx-4.19\)

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