Question

F(x) = -x² +8x -15, qual o resultado

Answer 1

2x²=8x

2x²-8x=0 a=2 b=-8 c=0

Δ=b²-4.a.c

Δ= (-8)²-4.2.0

Δ=64

x= -b±√Δ

2.a

x=-(-8)±√64

2.2

x=8±8

4

x¹=16/4=4

x²=0/4=0