Question

25x2 – 20x – 2 = -6

Answer 1

hey,

$25x^{2} - 20x -2 = -6 \\ 25x^{2} -20x -2 +6 = 0 \\ 25x^{2} -20x +4 =0 \\ \\ \Delta = {b}^{2} - 4 \times a \times c \\ \Delta ={( - 20)}^{2} - 4 \times 25 \times 4 \\ \Delta = 400 - 400 \\ \Delta = 0 \\ \\ \\ x = \frac{ - b \: \pm \sqrt{\Delta} }{2 \times a} \\ \\ x = \frac{ - ( - 20) \pm \: \sqrt{ \Delta} }{2 \times 25} \\ \\ x = \frac{20 \pm \sqrt{0} }{50} \\ \\ x = \frac{20}{50} = \frac{2}{5}$

$\boxed{crsjr}$