Question

Please, someone help? ​

Answer 1

x = -5 +
`√(26)`

Explanation:

f(x) = x² + 10x - 1

x² + 10x = 1

x² + 10x + 25 = 1 + 25

(x + 5)² = 26

take the square root of each side to get:

x + 5 = √26

x = √26 - 5 or -5 + √26