Question

resolva as equações​

Answer 1

7x² = 14

x² = 2

x = ±√2

x² = 49

x = √49

x = ±7

100x² = 25

x² = 25/100

x = √25/100

x = ± 5/10 = ±1/2

x² =81/4

x = √81/4

x = ±9/2

Answer 2

$\large\boxed{\boxed{\boxed{{Ol\'a}}}}}$

$A)\:\:7x^2-14=0$

$7x^2=14$

$x^2=\frac{14}{7}$

$x^2=2$

$x=±\sqrt{2}$$\checkmark$

$B)\:\:-x^2+49=0\:\:/\:(-1)$

$x^2-49=0$

$x^2=49$

$x=±\sqrt{49}$

$x=±7$$\checkmark$

$C)\:\:-25+100x^2=0$

$100x^2=25$

$x^2=\frac{25}{100}$

$x=±\sqrt{\frac{25}{100}}$

$x=±\frac{5}{10}$

$x=\frac{1}{2}$$\checkmark$

$D)\:\:x^2-\frac{81}{4}=0$

$x^2=\frac{81}{4}$

$x=±\sqrt{\frac{81}{4}}$

$x=\frac{9}{2}$$\checkmark$

:::::::boa interpretação:::::