👤

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


Răspuns :

a)

2 [tex]x^{2}[/tex] =98

[tex]x^{2}[/tex]=98 /2

[tex]x^{2}[/tex] =49

[tex]x = \sqrt{49}[/tex]

[tex]x=7[/tex]

b)

[tex]x^{2}[/tex] /4 =36

[tex]x^{2}[/tex]=[tex]36 * 4[/tex]

[tex]x^{2}[/tex]=144

x[tex]=\sqrt{144}[/tex]

[tex]x=12[/tex]

c)

[tex]3x^{2} =9\\x^{2} =9 / 3\\x=\sqrt{3}[/tex]

d)

[tex]4x^{2} =20\\x^{2} =20/4\\x^{2} =5\\x=\sqrt{5}[/tex]