Question

qual o resultado da equação do 2 grau x²-11x+18=0 ?

Answer 1

x² -11x +18=0

a=1

b=-11

c=18

Δ=b²-4ac

Δ=(-11)²-4(1)(18)

Δ=121-72

Δ=49

x=(-b±√Δ)/2a

x=[-(-11)±√49]/2

x=(11±7)/2

x'=(11+7)/2=18/2=9

x"=(11-7)/2=4/2=2

S={2,9}

Answer 2

x² - 11x + 18 = 0

Δ = b²−4ac

Δ = (−11)² −4⋅(1)⋅(18)

Δ = 121 − 72

Δ = 49

$x = \dfrac{-b \pm \sqrt{\Delta}}{2*a}\\ \\ \\ x = \dfrac{-(-11) \pm \sqrt{49}}{2*1}\\ \\ \\ x = \dfrac{11 \pm 7}{2}\\ \\ \\ x' = \dfrac{11 - 7}{2}\\ \\ \\ x' = \dfrac{4}{2}\\ \\ \\ x' = 2\\ \\ \\ x'' = \dfrac{11 + 7}{2}\\ \\ \\ x'' = \dfrac{18}{2}\\ \\ \\ x'' = 9$

S = {2, 9}