Question

Is 3.0 a root of the equation x2-0.9=0? Justify

Answer 1

Answer:

${x}^{2} - 0.9 = 0 \\ {x}^{2} = 0.9 \\ x = \\ {x}^{2} = \frac{9}{10} \\ x = \sqrt{ \frac{9}{10} } \\ x = \frac{3}{ \sqrt{10} } \\ x = \frac{3 \sqrt{10} }{10}$