Question

Решите уравнение 3х^2-10x-14=-х^2

Answer 1

3х² - 10x - 14 = -х²

3х² + x² - 10x - 14 = 0

4х² - 10x - 14 = 0 |÷2

2x² - 5x - 7 = 0

D = (-5)² - 4*2*(-7) = 25 + 56 = 81 = 9²

x₁ = (5-9)/4 = -1

x₂ = (5+9)/4 = 14/4 = 3.5