Question

Решите уравнение 1/7X^2 - 28 = 0

Answer 1

$\frac{1}{7} x^{2} -28=0 \\ \\ \frac{1}{7} x^{2} =28 \\ \\ x^2=28 : \frac{1}{7} \\ \\ x^2=28*7 \\ \\ x^2=196 \\ \\ x=б \sqrt{196} \\ \\ x_1=-14 \\ \\ x_2=14$

Answer 2

1/7х^2-28=0
1/7х^2=28
х^2=28÷1/7
х^2=28×7/1
х^2=196
х=корень из 196
х=14 или х=-14