Question

ENCUENTRA EL VALOR DE *X*
-X²+16=0
X²-81=0
49 x ²196=0
3 x ²-75=0
7 x ²-63=0
DOY CORONA
AL MEJOR​

Answer 1

Explicación:

$- {x}^{2} + 16 = 0 \\ 16 = {x}^{2} \\ \sqrt{ {x}^{2} } = \sqrt{16 } \\ x = 4$

${x}^{2} - 81 = 0 \\ {x}^{2} = 81 \\ \sqrt{ {x}^{2} } = \sqrt{81} \\ x = 9$

$49 {x}^{2} - 196 = 0 \\ 49 {x}^{2} = 196 \\ \sqrt{49 {x}^{2} } = \sqrt{196} \\ 7 x = 14 \\ x = \frac{14}{7} \\ x = 2$

$3 {x}^{2} - 75 = 0 \\ 3 {x}^{2} = 75 \\ {x}^{2} = \frac{75}{3} \\ {x}^{2} = 25 \\ \sqrt{ {x}^{2} } = \sqrt{25} \\ x = 5$

$7 {x}^{2} - 63 = 0 \\ 7 {x}^{2} = 63 \\ {x}^{2} = \frac{63}{7} \\ {x}^{2} = 9 \\ \sqrt{ {x}^{2} } = \sqrt{9} \\ x = 3$