Question

x² - 2x -7=-8. Me ajudem. Por favooor

Answer 1

$x^{2} -2x-7=-8 x^{2} - 2x + 1 = 0 a= 1 b= -2 c = 1 Δ= b^{2} - 4ac Δ= -4.-4 Δ= 16 x = -b +- \sqrt{Δ} / 2a x= 2 +- \sqrt{16} / 2 x = 2 +- 4 / 2 x' = 3 x" = -1 S = ( 3, -1)$