Question

menos x ao quadrado + 14x - 49 = 0 Bhaskara

Answer 1

-x² +14x -49=0

multiplicar por (-1)

x² -14x +49=0

a=1

b=-14

c=49

Δ=b²-4ac

Δ=(-14)²-4(1)(49)

Δ=196 - 196

Δ=0

x=(-b±√Δ)/2a

x=(14±√0)/2

x'=x"=14/2

x=7

S={7}