Question

URGENT VA ROOG,DAU CORANĂ Calculati a)-√5x+2,5=0 b)1 supra x-1=2

Answer 1

a)

$- \sqrt{5} x + 2.5 = 0 \\ - \sqrt{5} x = - 2.5 \\ \sqrt{5} x = 2.5 \\ x = \frac{25}{10 \sqrt{5} } = \frac{ \sqrt{5} }{2}$

b)

$\frac{1}{x - 1} = 2 \\( x - 1) \times 2 = 1 \\ 2x - 2 = 1 \\ 2x = 3 \\ x = 1.5$