solve the following quadratic equations (i) x²-4x+13=0
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x2 - 4x +13=0, here a=1 b = -4 c = 13, so D= b2 - 4ac , D = 16 - 52 , D = - 36 ,
x= b +- (b2 - 4ac)1/2/ 2a , x = -4 +-(-36)1/2/2
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