Question

А) x² -144=0 б)100-81x²=0 в)196-y²=0 г)225y² -64=0

Answer 1

X² -144=0
X²=144>0
X$_{1}$=√144=12
X$_{2}$=-√`44=-12

100-81x²=0
-81x²=-100
x²=$\frac{100}{81}$>0
x$_{1}$=$\sqrt{ \frac{100}{81} }$=$\frac{10}{9} = 1 \frac{1}{9}$
x$_{2}$=$- \sqrt{ \frac{100}{81} } =- \frac{10}{9} =-1 \frac{1}{9}$

196-y²=0
-y²=-196
y²=196>0
y$_{1}$=√196=14
y$_{2}$=-√196=-14

225y² -64=0
225y²=64
y²=$\frac{64}{225}$>0
y$_{1}$=$\sqrt{ \frac{64}{225} } = \frac{8}{15}$
y$_{2}$=$- \sqrt{ \frac{64}{225} } = -\frac{8}{15}$