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maylytail

x(x - 2) + 7 - (3x - 2)^{2} = {x}^{2} - 2x + 7 - (9 {x}^{2} - 12x + 4) = \ = {x}^{2} - 2x + 7 - 9 {x}^{2} + 12x - 4 = - 8 {x}^{2} + 10x + 3 = - 8( x + frac{1}{4})(x - frac{3}{2}) = \ = - ( 4x + 1)( 2x - 3) \ d = 100 + 96 = 196 \ x1 = frac{ - 10 + 14}{ - 16} = - frac{1}{4} \ x2 = frac{ - 10 - 14}{ - 16} = frac{3}{2}

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