Question

ayudme a resolver esta ecuación
a+ √(a^2-20) = 10

Answer 1

$a + \sqrt{ {a}^{2} - 20} = 10 \\ \sqrt{ {a}^{2} - 20 } = 10 - a \\ {a}^{2} - 20 = {(10 - a)}^{2} \\ {a}^{2} - 20 = 100 - 20a + {a}^{2} \\ 20a = 120 \\ a = 6$