Question

5x2+8-4=0 решите полное кв уравнения

Answer 1

$5 {x}^{2} + 8x - 4 = 0 \ d = {8}^{2} - 4 times 5 times ( - 4) = 64 + 80 = 144 \ x1 = frac{ - 8 + 12}{2 times 5} = frac{4}{10} = 0.4 \ x2 = frac{ - 8 - 12}{2 times 5} = frac{ - 20}{10} = - 2$