Question

решите уравнение -5х2 - 2х + 24=0

Answer 1

-10х-2х=24
-12х=-24
х=24:12
х=2

Answer 2

-5х² - 2х + 24 = 0
D = b² - 4ac
D = 4 - 4×(-5)×24 = 4 + 480 = 484
x₁ = -b + √D/ 2а   x₂ = -b - √D/ 2а
x₁ = 2 + 22/ -10 = -2,4
х₂ = 2 - 22/ - 10 = 2
Ответ: х₁ = -2,4; х₂ = 2