Question

Знайти нулі функції y=-x2+7x-3




ДАЮ 50 БАЛІВ!!!!!!!!!

Answer 1

Всё на фотографии.
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Answer 2

$y = - {x}^{2} + 7x - 3 \\ y = 0 \\ - {x}^{2} + 7x - 3 = 0 \\ {x}^{2} - 7x + 3 = 0 \\ a = 1 \\ b = - 7 \\ c =3 \\ D = b {}^{2} - 4ac = ( - 7) {}^{2} - 4 \times 1 \times 3 = 49 - 12 = 37 \\ x_{1} = \frac{7 + \sqrt{37} }{2} \\ x_{2} = \frac{7 - \sqrt{37} }{2}$