Question

Solve using the square root method. 9x^2 - 25 = 0
A. {-5/3, 5/3}
B. {-3/5, 3/5}
C. {-3, 5}
D. {-5, 3}

Answer 1

i think its C.

Answer 2

\[\Large 9x^2 - 25 = 0\]


\[\Large 9x^2 - 25+25 = 0+25\]


\[\Large 9x^2 = 25\]


\[\Large \frac{9x^2}{9} = \frac{25}{9}\]


\[\Large x^2 = \frac{25}{9}\]


\[\Large \sqrt{x^2} = \pm\sqrt{\frac{25}{9}}\]


\[\Large x = \frac{5}{3} \ \text{or} \ x = -\frac{5}{3}\]