Question

y=-x^2+2x+8 очень срочно

Answer 1

$y = - {x}^{2} + 2x + 8 \ d = {b}^{2} - 4ac = 4 + 32 = 36 \ x1 = frac{ - b - sqrt{d} }{2a} = frac{ - 2 - sqrt{36} }{ - 2} = 4 \ x2 = frac{ - b + sqrt{d} }{2a} = frac{ - 2 + sqrt{36} }{ - 2} = - 2$
Ответ: x1= 4, x2= -2