Question

2x²-6x=8 POR FAVOR, no entiendo.

Answer 1

2x² - 6x - 8 = 0

divide toda la ecuación sobre 2

x² - 3x - 4 = 0

Formula general

a = 1 b = -3 c = -4

x = [ -b ± √(b²-4ac) ] / 2a

x = [ -(-3) ± √((-3)²-4(1)(-4)) ] / 2(1)

x = ( 3 ± √25 ) / 2

x = (3±5) / 2

x = 3+5 / 2 ó x = 3-5 / 2

x = 8/2 ó x = -2/2

x = 4 ó x = -1