Question

2x²-7=15 ME AJUDEM POR FAVOR​

Answer 1

2x²-7x=15 ==> corrigida

2x² -7x -15 = 0

∆ = b²-4ac= (-7)²-4.2 (-15)= 49+120 = 169

√∆=13

x = -b±√∆/2a

x = 7±13/2.2

x' = 7+13/4 = 20/4 = 5

x'' = 7-13/4 = -6/4 = -3/2