Question

rezolva ,in mulțimea numerelor reale,ecuații:
a)2x²=98
b)x²supra4=36
c)3x²=9
d)4x²=20
va roggggg repedeeeeeeeeeee!!!!!!!!
​

Answer 1

a)

2 $x^{2}$ =98

$x^{2}$=98 /2

$x^{2}$ =49

$x = \sqrt{49}$

$x=7$

b)

$x^{2}$ /4 =36

$x^{2}$=$36 * 4$

$x^{2}$=144

x$=\sqrt{144}$

$x=12$

c)

$3x^{2} =9\\x^{2} =9 / 3\\x=\sqrt{3}$

d)

$4x^{2} =20\\x^{2} =20/4\\x^{2} =5\\x=\sqrt{5}$