Question

y= -x² + 2x + 15
Resolva na formula de bhaskara.

Answer 1

-X² +2X + 15=0
Δ=2²-4*(-1)*15
Δ=4+60
Δ=64
x=-2+-√64/2*(-1)
x1=-2+8/-2  x1=6/-2  x1=-3
x2=-2-8/-2  x2=-10/-2  x2=5
S={-3, 5}