Question

resolva a equação pela formula de bhaskara​

Answer 1

Resposta:

(x + 3)² = 2x . (x + 7)

(x + 3) . (x + 3) = 2x . (x + 7)

x² + 3x + 3x + 9 = 2x² + 14x

x² + 6x + 9 = 2x² + 14x

x² - 2x² + 6x - 14x + 9

- x² - 8x + 9 = 0

Δ = b² - 4 . a . c

Δ = (- 8)² - 4 . (- 1) . 9

Δ = 64 + 36

Δ = 100

x = (- b ± √Δ)/2 . a

x = (- (- 8) ± √100)/2 . (- 1)

x = (8 ± 10)/- 2

x' = (8 + 10)/- 2

x' = 18/- 2

x' = - 18/2

x' = - 9

x'' = (8 - 10)/- 2

x'' = - 2/- 2

x'' = 2/2

x'' = 1