Răspuns:
a:
[tex]x = \pm 6[/tex]
b:
[tex]x = \pm \sqrt{3.24}[/tex]
[tex]x \approx \pm 1.8[/tex]
c:
[tex]x = \pm \sqrt{\frac{25}{4}}[/tex]
[tex]x = \pm \frac{5}{2}[/tex]
d: Nu cred ca are sloluții reale ptc e cu minus.
e:
[tex]x^2 = 900[/tex]
[tex]x = \pm \sqrt{900}[/tex]
[tex]x = \pm 30[/tex]
f:
[tex]4x^2 = 81 - 1[/tex]
[tex]4x^2 = 80[/tex]
[tex]x^2 = 20 )[/tex]
[tex]x = \pm \sqrt{20}[/tex]
[tex]x = \pm 2\sqrt{5}[/tex]
