Solve the following quadratic equations and give your answer correct to two significant figures : (i) x 2 - 4x - 8 = 0 (ii)

(i) The given equation is x 2 - 4x - 8 = 0 Comparing it with ax 2 + bx + c = 0, we get a = 1 , b = -4 , c = -8 By using formula, we obtain: Hence roots of the given equations are 5.5 , -1.5. (ii) Given, Comparing it with ax 2 + bx + c = 0, we get a = 1 , b = -6 , c = -18 By using formula, we obtain: Hence roots of the given equations are 8.2 , -2.2.