Question

решить уравнения;

х²-16=0
1/9 - х²=0
а²-0.25=0
в²+36=0
4х²-9=0
81х²+4=0

Answer 1

$x^2-16=0 \\ x^2=16 \\ x=\pm 4$

$\frac{1}{9}-x^2=0 \\ x^2= \frac{1}{9} \\ \\ x=\pm \frac{1}{3}$

$a^2-0.25=0 \\ a^2=0.25 \\ a=\pm 0.5$

$b^2+36=0 \\ b^2=-36 \\ b \in \emptyset$

$4x^2-9=0 \\ 4x^2=9 \\ x^2= \frac{9}{4} \\ \\ x=\pm \frac{3}{2}$

$81x^2+4=0 \\ x^2=- \frac{4}{81} \\ x \in \emptyset$