Question

Which statement about the following equation is true? 2x2 – 9x 2 = –1

Answer 1

${2x}^{2} - {9x}^{2} = - 1$

${ - 7x}^{2} = - 1$

${x}^{2} = - 7 \times - 1$

${x}^{2} = 7$

$x = \sqrt{7}$