Question

СРОЧНО ДАЮ 40 БАЛЛОВ 7кл
Решите уравнение:
1) х2 – 16 = 0;
2) 25 - y2 = 0;
3) 3,24 - 22 = 0;
4)144/169-n2 = 0​

Answer 1

1)

$\displaystyle x^2-16=0\\\\x^2=16\\\\x=\pm4$

2)

$\displaystyle 25-y^2=0\\\\25=y^2\\\\y= \pm 5$

3)

$\displaystyle 3,24-z^2=0\\\\z^2=3.24\\\\z= \pm 1.8$

4)

$\displaystyle \frac{144}{169}-n^2=0\\\\\frac{144}{169}=n^2\\\\n= \pm \frac{12}{13}$