Question

me ajudem com essa conta





y=-x²+2x+ 15 ​

Answer 1

Resposta:

y= -x² +2x+ 15 a=-1 / b=2 / c=15

a) ∆= b²-4ac

∆= (2)² -4.(-1).(15)

∆= 4+60

∆= 64

x= -b±√∆

-----------

2a

x= -(2) ± √64

-----------------

2(-1)

x= -2±8

--------

-2

x¹= -2+8 = 6 = -3

--------- ---

-2 -2

x²= -2-8. = -10 = 5