Question

Решите уравнение f(x)=10, если f(x)=5x-10/x

Answer 1

50-10/10=50-1=49 вот и все!

Answer 2

не x = 10 а f(x)

Answer 3

5x - 10/x = 10 (умножим на x)
5x^2 -10x - 10 = 0
D = b^2 - 4ac = 100 + 200 = 300
x1 = (-b + √d)/ 2 = (10 + √300)/ 2
x2 = (-b - √d)/ 2 = (10 - √300)/ 2