Question

x2-11x28=0
alguém pra ajudar nessa

Answer 1

x² - 11 x  + 28 = 0

a = 1

b = - 11

c = 28

DELTA

Δ = b² - 4 . a . c

Δ = (-11)² - 4 . 1 . 28

Δ = 121 - 112

Δ = 9

X

$X = \frac{- b +-\sqrt{\Delta}}{2.a} \\ \\ X = \frac{11 +-\sqrt{9} }{2} \\ \\ X = \frac{11+-3}{2} \\ \\ \\ X' = \frac{11 - 3}{2} = \frac{8}{2} = 4\\ \\ \\ X'' = \frac{11+3}{2} = \frac{14}{2} = 7$