Question

Solve for x the quadratic equation x^2-4x-8=0. Give your answer correct to 3 significant figures​

Answer 1

Answer:

x =  (1.464) ; (-5.464)

Step-by-step explanation:

x = (-4 +- $\sqrt{4^{2} - 4(1)(-8) }$ )/(2*1)

x = (-4  +-  $\sqrt{48}$)/ (2)

x = (-4  +-  2$\sqrt{12}$ ) / 2

x = 2 (-2  +-  $\sqrt{12}$)/2

x =  (-2 + $\sqrt{12}$) ;  (-2 - $\sqrt{12}$ )

x = (-2 + 3.464) ; (-2 - 3.464)

x =  (1.464) ; (-5.464)

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