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Solve for X the Quadratic Equation X2 - 4x - 8 = 0. Give Your Answer Correct to Three Significant Figures. - Mathematics

Sum

Solve for x the quadratic equation x2 - 4x - 8 = 0.  
Give your answer correct to three significant figures. 

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Solution

`x^2 - 4x - 8 = 0`

Comparing the above equation by `ax^2 +bx + c = 0`

 a = 1 , b = -4 , c = - 8

`x = (-2 +- sqrt(b^2 -4 ac))/(2a)`

`x = (4+- sqrt(-4)^2 - 4 xx 1 xx (-8))/(2xx1)` 

`x =(4+- sqrt(16+32))/2` 

`x = (4+- sqrt(48))/2`

`x = (4+- 6.928)/2`

x = 5.46 and -1.46 {approx}

  Is there an error in this question or solution?
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