помагите..)
x^2-20x=-5x-13-x^2
x^2 -20x +5x +13 +X^2 =0
2x^2 -15x +13 =0
D = 225 -4*2*13= 225-104=121
x = 1 x = 6.5
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x^2 -20x +5x +13 +X^2 =0
2x^2 -15x +13 =0
D = 225 -4*2*13= 225-104=121
x = 1 x = 6.5