Question

решите уравнение 2х2-9х-10=0

Answer 1

2х²-9х-10=0
а=2
b= -9
c= -10
D = b²-4ac = (-9)²-4*2*(-10) = 81+80 = 161
x₁ = -b-√D / 2a = -(-9)-√161 / 2*2 = 9-√161 / 4
x₂ = -b+√D / 2a = -(-9)+√161 / 2*2 = 9+√161 / 4