# 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.

#### 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}

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