Вопрос школьника по предмету Математика
8 клас Решить квадратное уравнение 3-0,4²=0
Ответ учителя по предмету Математика
D = b² — 4ac = 121-4 * 4 * (-3) = 121 + 48 =√169=13
x₁ = (-b+√D)/2a = (-11+13)/(4*2) = 1/4
x₂ = (-b-√D)/2a = (-11-13)/(4*2)=-24/8= -3
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