Question

2 x = 15 - x² me dêem a resposta por favor

Answer 1

2 x = 15 - x²

x² + 2x -15 = 0

∆=b²-4ac=2²-4.1.(-15)=4+60=64=>√∆=8

x' = -b+√∆/2 = -2+8/2 = 6/2= 3 ✓

x" = -b-√∆/2 = -2-8/2 = -10/2= -5 ✓