Question

2x al cuadrado menos 49 =0 es ecuacion cuadratica pura

Answer 1

$(2x)^2-49=0\\ \\4x^2-49=0\\ \\4x^2=49\\ \\x^2=\frac{49}{4}\\ \\x=\sqrt{\frac{49}{4}}=\frac{\sqrt{49}}{\sqrt{4}}=\frac{\pm7}{\pm2}\\ \\x=\pm\frac{7}{2}$