Question

0.2x²-1.8=0 Помогите быстрее

Answer 1

$0.2x {}^{2} - 1.8 = 0 \ frac{1}{5} x {}^{2} - frac{9}{5} = 0 \ frac{1}{5} x {}^{2} = frac{9}{5} \ x {}^{2} = 9 \ x = + - 3 \ x = 3 \ x = - 3$