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√x = u => x = u²u + √(u² - 40) = 10√(u² - 40) = 10 - uu² - 40 = u² - 20u + 10020u = 140 => u = 7 => *x = 49*
49.
It took a couple minutes but it occurred to me that x = 49. Other solutions might exist among the complex numbers.
√x = u => x = u²
u + √(u² - 40) = 10
√(u² - 40) = 10 - u
u² - 40 = u² - 20u + 100
20u = 140 => u = 7 => *x = 49*
49.
It took a couple minutes but it occurred to me that x = 49. Other solutions might exist among the complex numbers.