Question

What are the solutions to the equation 2(a + 4)^2 -126 = 0​

Answer 1

`2{(a + 4)}^(2) - 126 = 0 \\ \Leftrightarrow 2{(a + 4)}^(2) = 126 \\ \Leftrightarrow {(a + 4)}^(2) = 63 \\ \Leftrightarrow a + 4 = \pm3 √(7) \\ \Leftrightarrow a = - 4\pm3 √(7)`